I'm and IDPA member and the stuff still confuses me. All my SIGs are currently box stock, but I can (in theory) shoot my 226 and 229 in ESP as well due to their caliber (.357 SIG and .40 S&W, respectively). The rule book is well written and easy enough for me to understand, but changes are often and rapid. I know you already looked at it, but it can't hurt to print it out, go over it a few times, then take it with you to the match to use as reference when asking questions. Good luck!
Keep your feet and knees together...
[This message has been edited by Mike Spight (edited May 05, 1999).]