Ryan-
I agonized over the same thing just a few months ago, before I started shooting IDPA.
To put it simply, stop thinking about it and go do it.
Don't worry too much your first time out.
Go slow, be smooth, and don't drop your gun or shoot off a finger.
After you get comfortable, try speeding up a little.
I promise that you'll surprise yourself with how well you do.
You'll meet some really nice people who will really want to help you shoot better.
Being a Crews grad, you'll probably shoot better than some of the other folks out there.
You've had some great instruction, so don't be afraid to dispense a few pointers yourself.
I'm only a few months in myself, but I'm already wanting to go try IPSC. I'll get stomped, but trigger time is trigger time.
Once again, stop thinking about it and go do it. You'll never regret it.
Oh yeah, once you get settled into it, take a friend out and introduce them to IDPA as well.
What city are you in?