Regrettably, it has proved almost impossible to permanently and safely cure phimosis by any form of stretching.
When you stretch the foreskin you cause minute tears in the thin inner mucosal layer and these heal to scar tissue which is even less elastic than the rest of the tight foreskin, so your phimosis actually gets worse rather than better.
Should you manage to stretch without tearing (a rare occurrence) then the foreskin has a tendency to return itself to the phimotic state a short while after you cease the stretching exercises. So they are all in vain.
he ONLY sure, immediate, and safe method is to get circumcised. Of course there is a risk with surgery, but with circumcision (a simple external procedure) done by an experienced doctor under local anaesthetic the risk is absolutely minimal. Any 'horror' stories you may have heard are either total fiction made up by the anti-circ activists, or are the result of using an unskilled circumciser or failing to follow reasonable after-care instructions.
I've known several who have had teen or adult circumcisions from experienced doctors and all have been totally pleased with the result and had no problems.