Didn't read the whole thread here but here's my 02..
I used to have a twin turbo G35 that I used to track. I never tracked it when it was N/A so I started tracking with a 350whp car. It was so much fun, and to be honest I never even worried about the thread of crashing my car. I was always concentrating on my driving and only 1 time out of 5 or 6 track days did I go off track, and it was only onto some dirt. Nothing major.
If you have the chance to go to the track, do it. You will not regret it. But as others have said make sure you go with an established group like speed ventures, redline time attack HPDE (you don't need to compete), porsche club, etc. They will have instructors and you will have a blast. Just don't act like you're actually racing other cars, because you're not. You're there to have fun and drive your car fast around corners legally.
I can't wait to get my M3 and take it out..it'll be a blast.