Fit your horse with a lunge cavesson and a 2530ft (7.69.1m) lunge line. Stand in the middle of the pen, position your body in the direction that you want your horse to move, and lift the lunge whip towards your horse's hip. As your horse moves forward, say "Walk," loudly and clearly. Face your horse as it moves around the circle, keeping your body just behind the withers and the lunge whip at the hip. Position yourself so that you form a triangle between the horse's haunches, its shoulder, and yourself. You will use your body position to help drive the horse forward. You moving with your horse tells it to keep moving forward. To slow down or stop, relax your body, move with your horse more slowly, and lower the whip. Say "Stop!" or "Whoa!" clearly. To start trotting, raise your shoulders slightly, move more energetically, and slightly elevate the lunge whip at your horse's hip. Give a clear, verbal "Trot!" command. A lunging whip is only a training tool and should never be used as punishment. Spend the coming weeks and months working with your horse to get correct and consistent responses. Ensure that your horse can walk on, trot, slow down, and come to a full halt using verbal cues. Although each command is important, getting your horse to come to a full stop regardless of the situation is the highest priority. To move clockwise, feed the left line through the left stirrup so that it wraps gently around your horse's rear, and hold this in your left hand. Hold the right line in your right hand. Start lunging your horse normally with the lunge whip and practice each gait. To prepare your horse for long lining, tack up the saddle and bridle. Connect the stirrups together under your horse's belly using a leather strap to stop them moving around. Attach 1 long line to each bit ring. To move counterclockwise, feed the right line through the right stirrup and hold this in your right hand. Then hold the left line in your left hand and lunge from the other direction. Keep the lines tight enough so your horse can't trip, but loose enough that it can feel the slack lines around its rear, tail, back, and legs. Spend as much time as your horse needs to train with the long lines. Check that your horse is fully comfortable with the feeling of the lines and that every walk on, trot, slow down, and full halt command gets the right response.
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One-sentence summary -- Train your horse to lunge in a round pen. Practice lunging until your horse responds to every verbal cue. Train with a long line to get your horse used to 2 lines. Practice long lining until every verbal command gets a correct response.

Hold one end on one hip. It doesn't matter which side you start with. You can also pull it more towards your middle if that's easier for you. Just make sure you hold on to that end as you bring the other end around. Cloth measuring tapes are soft and flexible tools you can find in sewing kits and craft stores. Most measuring tapes go up to 5 five or so. Most big box stores and drug stores will also carry sewing kits. You can also print a tape measure off the internet. You can find these with a simple search online. You simply cut them apart, align the edges, and then glue or tape them together. Of course, you need to be careful with this type of tape measure, as it can rip easily. However, don't try to use card stock, as that can be too stiff to get a good measurement. Don't use metal measuring tapes. Metal measuring tapes, the kind you use for do-it-yourself improvement projects, are not good for taking measurements of your body. They aren't flexible enough, so they won't give you an accurate measurement. Wrap it around your backside, being careful to make sure it doesn't twist. Pull the tape around to the other end from the other hip. Make sure you are getting it around your rear end at the same time. You can also start out holding both ends and step over the tape so it's on your backside. This movement can help if you have trouble wrapping it around the back. Now that you've got it wrapped around, check to make sure you've got it right in the mirror. The tape should be parallel to the floor all around, and it shouldn't be twisted at all. Make sure it looks even. You'll need to shift around to check out the back side of the tape. Turn to the side so you can see. When measuring, the tape should be snug around your hips. However, it shouldn't be cutting off circulation. It should be tight enough that you can only fit a finger underneath it, no more. You can look down to find out your measurement. You measurement is where the end of the tape meets a number as the tape measure comes around. You may need to look in the mirror to read the number more easily. Now that you've figured out what your hip measurement is, write it down so you can save it for later. You'll also need other measurements to make clothing, such as your bust, hip, thighs, waist, and inseam, depending on what you're making. Like your hips, you measure your thigh at the thickest part of your leg. The inseam is the inside of your leg from your crotch to where you want your pants to fall. If you have a pair of pants that are the length, you can measure the inseam on them instead of your body. When you make clothing, you don't make it to your exact measurements because then it would be skin-tight, which would mean it would be difficult to move. Therefore, you must add a few inches to make it more wearable. You add inches for two reasons. One, as already stated, is to make the clothing more wearable. However, you might also add inches to create a design. For instance, if you want a really flowing, poofy skirt, you might add more inches at the hip than for an a-line skirt. How much the cloth gives also affects how many inches you add. That is, if it is especially stretchy, you probably don't need to add as many inches. Most patterns will help you determine how many inches to add. However, if you are doing it yourself, you should add 2 to 4 inches (5.1 to 10cm), depending on how tight or loose you want your clothing. Also, if you're a bit curvier, you may want to add more inches to allow for better movement.
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One-sentence summary --
Hold a cloth tape measure on one hip. Go around the back. Check in the mirror. Make it snug. Read the measurement. Write down your hip measurement. Add a few inches when making clothing.