The easiest and probably most effective position for autofellatio is lying on your back. You’ll probably want to use a bed, sofa, or other cushioned surface for comfort, although practicing on a carpeted floor can sometimes give you better leverage. You should have a wall or a headboard nearby to brace your feet against. Lie down (naked, of course) with the top of your head at least a foot from the wall. Pull your legs up and roll back onto your shoulders, raising your legs over your head. Brace your feet on the wall and “walk” your way down until your crotch is close to your face. Lift your head up if necessary to get closer. If your back feels tight, don’t strain to reach your cock, even if it’s tantalizingly close. Just let your muscles stretch. You may want to use one hand to pull your cock closer. Suck what you can, if you can – otherwise, just wank and keep practicing.