Hi warrior:
Welcome here, I just want to warn you, about hanging a little bit. There is something called necropsy, and this is when the muscle, or a part of the body dead, because, there is no circulation of blood in that area. Some says this came in 15 or more minutes. I’m not so sure.
So, besides that, if you don’t make the warm ups, and wrapping, you could get some injuries, over training fatigue, and a lot lot more.
Of course, taken all the precautions, can lead you to some gains, but remember that you have only one penis, and don’t want to lost it.
I recommend you, depending on your knowledge and practice on PE, that practice, the manual routines first. Later you can choose what better fits to you. Also, if you can, read all the posts you think you need.
Ok, good luck with your inches.