You should hold your harmonica nestled in your left hand, with your thumb supporting the bottom of the instrument and your other fingers along the top. The harmonica should be oriented so that the numbers printed on its holes are facing upwards. Take your hand and form an open C-shape with your fingers and thumb. Your harmonica should be positioned deeply into the C-shape, tucked into the area where your thumb joins your hand. You should not pucker your lips as you would for a kiss or play the harmonica with only the outer portion of your lips. The case of the harmonica will need to be in contact with the inner part of your mouth to give you proper control while playing. Your lips should touch the casing and the wood/plastic body should be inside your mouth. For the best control and quality of tone, you should try to keep your jaw as relaxed as possible while playing. Your jaw should be slightly lowered when playing your harmonica. This will create more space in your mouth and give your playing a richer tone. While getting used to forming a proper mouth seal with your harmonica, it can be difficult holding the instrument in position while keeping your jaw relaxed. Take your time, and practice until this becomes second nature.
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One-sentence summary -- Hold your harmonica correctly. Form a seal with your harmonica and mouth.

Let the plastic come back to room temperature before you continue working on it. Welded plastic doesn't take long to cool down, but you can wait as long as you please. Look for the welded plastic to turn solid. If you don't feel any heat coming off of it, you are ready to work on it. The best time to fix a weld is before it cools. A good weld looks relatively smooth and consistent. Add more of the welding rod or smooth out the melted plastic with your gun as needed. Set your welding gun aside when you're done. Remember to put it in a safe spot, such as in a heat-resistant holster, until it cools. Smooth out the rough ridges on the weld to make it look consistent with the rest of the plastic. Apply light pressure to the weld, rubbing the sandpaper back and forth across it. Try to get the weld to look level with the area around it, but be careful to avoid scratching the plastic around it. If you're looking for a speedier way to do this, use a sanding wheel on a rotary tool. Be careful, though, since plastic is relatively soft and easy to scratch. Switch to finer grits of sandpaper to neaten out the weld. Higher-grit sandpaper is finer and less abrasive, but it can still scratch the plastic if you're not careful. Rub the weld down like you did with the 120-grit sandpaper until it looks consistent and feels smooth to the touch. Always start with the lower-grit sandpaper. It is coarser, so it wears away more of the plastic. Save the higher-grit sandpaper for finishing.
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One-sentence summary -- Wait at least 5 minutes for the plastic to cool. Sand the welded joint down with 120-grit sandpaper. Finish the plastic with 180 and 320-grit sandpaper.

Boston ferns will do best in a potting mixture of peat moss, sand, and garden soil. You can buy all of these at your local gardening store. Your final mixture should be even parts of each ingredient. The pot should be big enough for your fern to sit comfortably without it's roots being near the drainage holes, but without a lot of extra space that could accumulate "root rot." Put your mixture and plant into the clean pot with drainage holes in the bottom.The fern can be planted about half of the way to the top of the pot so that the roots have space in the soil. Fill in the rest of the pot with more potting mixture, leaving about 1 inch( 25.4 mm) of space from the top. In many places, the summers are warm and humid enough to provide the perfect environment for a Boston fern. They do best in environments with humidity levels of at least 50 percent. If your daytime temperatures are between 65 to 75 degrees Fahrenheit (18 to 24 degrees Celsius), and your nighttime temperatures are between 55 and 65 degrees Fahrenheit (13 to 18 degrees Celsius), your Boston ferns will thrive outdoors. You can place them on your porch or patio, and they should do well. The cooler temperatures at night will help to prevent fungus from developing. If you are keeping your Boston fern indoors, whether permanently or just for the winter months, you will need to be careful about making sure it has adequate humidity. The very best thing to do is to place it in a room with a humidifier. Keep your house between 65 to 75 degrees Fahrenheit (18 to 24 degrees Celsius), and put it in a cooler room at night. If you don't want to invest in a humidifier, there are other options. You can place your fern in a saucer filled with small stones and water. The water will create humidity as it evaporates. Boston ferns do best when receiving indirect, filtered sunlight. If they're outdoors, place them somewhere where they will get sunlight through tree branches, or cracks in a porch roof. If they're indoors, place them near a window. You don't want your fern to be in shade, but you don't want them to be in direct sunlight. It's a delicate balance.
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One-sentence summary -- Gather your potting supplies. Pot your fern. Place your fern outdoors in a warm, humid environment. Put your Boston fern in an appropriate room indoors. Provide your fern with indirect sunlight.

Most multivitamins contain a good amount of B12. Look at the informational label on your multivitamin to make sure it provides the B12 you need. You can also buy B12 supplement pills. B12 absorbs easier when it is taken along with other vitamins. Take it with B6, magnesium, niacin, or riboflavin. If you none of these methods work, you can try a B12 prescription from your doctor. This supplement comes in the form of an injection or a nasal gel.
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One-sentence summary --
Take a multivitamin. Take a separate B12 supplement. Get a B12 prescription.