What methods do you need to use to autofellatiate?

Understand that some guys can and some can't. Some are just more flexible than others. That is more important than penis length. Some can manage it by sitting at the corner of a bed or on a hard chair and simply bending over while clenching the stomach muscles. Another way is to lay on your back on the floor. Keeping your legs together, raise them up and over your head and touch the floor with your toes behind your head. With the stomach muscles clenched, this should allow you to do it if you are meant to do it. You have to be careful while doing this because it puts a lot of pressure on your neck and lower back. Stretching or yoga can help loosen you up. The younger you are, the easier this is probably going to be since we all tent to stiffen up as we age.