From my limited understanding of GH, your are looking at slow but sure progress, and its use must be prolonged. That coupled with the fact that it will be very exspensive to run for a long period of time makes me wonder how worth it, GH would be.
If you really want to "define muscle" the first place to start is your diet, not injections bro.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.