You can use a comb to straighten the hair out as you grab it. The 45 degree angle is important to ensure the hair blends well at the back and sides; the slant should go down towards the neckline. Your fingers will serve as a guide; all the hair beyond will be cut. You want to hold the hair firmly, so that it is taut, but not so much that it hurts your child. Be sure to maintain your grip on your child's hair, so it doesn't slip out as you cut. These scissors are very sharp, be careful not to cut yourself. Again make sure the 45 degree angle is slanted towards the neckline. Cutting this way will ensure the hair will have a soft V shape as it tapers towards the neck. Bend down to eye level to ensure the neckline is even. Always start by taking the hair between your index and middle finger at a 45 degree angle, holding it taut, then cutting along your fingers. Each section of hair that you cut should be used as a guide to measure up against the next section of hair that you cut. To keep the length uniform, ensure that each new tuft of hair you grab includes some of the hair you've already cut. Cut hair this way until you reach the bottom of the crown of the head. Gently fold each ear down, and use your scissors to cut the hair around it. Cut as if you were tracing the pattern of an ear. The process for cutting here is similar to the sides, save for the angle. Pull the hair straight out of the head at a 90 degree angle rather than 45. Hold the hair between index and middle fingers, and cut along your fingers. As with the sides and back, each new cut should have a few hairs from the previous cut to serve as a guide. If you want to add texture to the hair, you can point-cut it (angling the scissors upwards and cutting at the hairs to vary lengths). Do this by running your fingers through different sections of the hair, pulling up. While the hair should angle as it transitions from the top to the sides and back, there should be no long hairs sticking out If there are any long hairs that shouldn't be there, measure them against their neighboring section and trim them accordingly.
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One-sentence summary -- Take a tuft of hair at the neckline between your index and middle finger at a 45 degree angle. Use hair shears to cut the hair along your fingers. Move to the opposite side of the neckline and repeat this process. Repeat this same cutting process for the back and sides. Cut the hair around the ears. Cut the hair at the top of the head at a 90 degree angle. Check the haircut's uniformity.

No matter whether you sleep on your back, stomach, or side, adding pillows can help provide support. Basically, you want to add a pillow anywhere there's a space between your body and the mattress. For instance, if you sleep on your stomach, which is the worst position for your back and posture, place a flat pillow under your stomach to provide support. Choose a flat pillow or no pillow for your head. If you sleep on your back, place a small pillow behind your knees, and choose a supportive pillow for your head. If you sleep on your side, place a pillow between your knees and pull them up towards your chest. Pick a pillow for your head that keeps your spine straight, or use a full body pillow. Avoid turning at your waist while you are in bed. Instead, keep your back straight and your stomach muscles tight, and turn your whole body when you want to reposition yourself. While you may have heard that one mattress or another is best for a healthy back, the truth is whatever works for you is best. Choose one that lets you rest comfortably and wake up pain free. Remember to replace your mattress every decade or so. If your mattress isn't providing the support you need, add a board between the box springs and mattress, which should keep it from sagging.
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One-sentence summary --
Provide support for your back with pillows while sleeping. Turn your body as 1 unit when laying down. Sleep with good posture by choosing a comfortable mattress.