Their is risks with anything and Penis Enlargement has risks too but alot of the info' you found on Google is bullshit, I've seen it myself and alot is made to sound worse for various reasons.
I would advise you start doing 150 reps perday at a light intensity at a 70 to 80 percent erection, or just more than semi erect.
When you get more used than you can go up in reps and intensity...if you jump into intensity right away than you could hurt yourself.
The risks are just from guys who think they know it all or can do it all, they run in and kill their penis...would you really do 500 reps of wet jelqs at full erection on your first try? yes if your a prick wanting to kill your dick and no if your sensible and want gains.
I would say hand on heart that wet jelqs are the most powerful Penis Enlargement exercise in the world and they are the backbone of natural penis enlargement, you look around and see....horse squezes, ulis,
SSJ ect ect are all based on the jelq method, its the backbone that alot of NPenis Enlargement is based upon....its probably also arguebly the oldest NPenis Enlargement method in the world, alongwith stretching.....yeah the arabs did and still do this.
Take your time, learn your boundaries and with time you'll be able to go further...dont push yourself too quickly too soon, thats whats the danger is in pe....over confidence and exitement of what could be had.