First of all, a little piece of advice: don't take advice from anyone who can't even SPELL "artery" or "groin."
Also, I'm a little worried that you're so quick to jump into your groin

I figure the closer you get to your dick with a needle the more likely it is that you should just quit while you're ahead (in other words, alive).
Anyone who's done any research and reading up on IV knows to stay away from the groin, so I have a feeling you've jumped into IV without really educating yourself (if you had, you probably wouldn't be in a position where you're arms and hands were all used up).
I'm not trying to be mean (it comes naturally), but if you can take a deep breath, look in the mirror and admit you haven't been so smart about your injecting, then maybe you can admit you might be wrong about your idea that it's time to stick it in your "special area."
Here's what I think a good game plan is: stop injecting for a short time. Snort and plug while you re-educate yourself and give your veins time to heal (def read up on plugging, the blood vessels in your fudge tunnel absorb drugs almost as effectively as IV, so you can still get a good buzz with almost no risk).
As suggested, go to a needle exchange and ask for help. I know it's kind of weird to go to some strangers and say "hi, can you give me junkie lessons?" but trust us, they WANT to help people like you stay safe. They'll probably even give you a chocolate bar for being brave enough to come forward.
They will check out your arms and help you figure out if it's as bad as you think. They will show you what to do and give you reading material on how to IV.
This whole process will probably take less than a few weeks and, chances are, your groin will live to love again.
Oh, and to whomever said missing a shot in your hands hurts more than the arms, I don't agree - no matter where you miss, sometimes it's better than others.
Good luck Mr Groin and may the FORCE be with you!