How to stretch

Right now I am deathly close to 6” girth so I want to focus only on length and erection quality. For length, I suppose light jelqing with lots of stretching would be the key.? When stretching, It feels like the only thing that hurts in the skin that is stretching in the process. Is this normal to feel or should I not feel my skin stretching over my penis stretching?

Also, for erection quality, I plan to jelq in small amounts each day. Will this improve it or should I jelq alot? I don’t want any girth gains if I can help it because of oral sex.