Due to my weight, I am unable to see my penis (more of a grower than shower

Although I am exercising to lose weight now, have you had a similar experience and used a mirror to inject your penis? My urologist didn't give me much hope of using this method (actions are backwards in a mirror), but it's all I have at this point (wife is an option, but not counting on her injecting me). I've found more information and hope in this forum than any other so do you have any suggestions?
ALPRO/PAPA/PHEN 10MGC/15MG/1MG - (I have no idea what that formula means) First dose was .03 with little if any change. Next will be .04, but I'm not expecting that much difference. If you've used a similar formula, what was your results?
My first injection was a couple weeks ago and done by the Dr. It hurt a lot.
1. Do you quickly stab the needle in or
slowly insert it?
2. Do you recommend a numbing cream for the injection spot? If so, what brand?
I haven't had problems with multiple injections in other parts of the body, but this spot is a little different
Thanks guys!
Hard Times (are coming I hope)
Married 37 years. Radical Prostatectomy 4/14/2017. Cancer free so far. Had first injection 4/2019 at doctor's. ALPRO/PAPA/PHEN 10MGC/15MG/1MG. Still wavering if I can inject myself.