Oh, i've gotten your PM and thought you meant something completely different; retracting your foreskin has nothing to do with circumcision; autocircumcision means to cut your own foreskin.

All that's involved is that you pull your foreskin back, and wear snug underwear.If you have a long foreskin you can fold the outer foreskin into the inner foreskin, but this is pretty bulky and doesn't stay for very long. Some guys actually tape theirs back, and you can google that if you're interested.