It's apparent from the fact that you would post to this board and be so desperatley in need of advice that you haven't got a clue what you're doing.
One option is to learn the make and model of the boards you're interested in and learn your self, good luck with that
The best advice you've gotten is to cozy up with some local soundguys.
If you try this without permision you're a greedy jack-ass in my book and you deserve the ass-kicking that you're bound to recieve.
Actually, I did study the user guide of the Soundcraft 200b and that's how I figured out that I need to plug into the CR outs. Like I said before, I never would have plugged in randomly trying to get a feed, and no harm can be done by plugging the correct cables into a line out. The chances of that blowing the system are about 1 in a million. I just figured it would be easier to ask you guys before I spent hours researching. And no, the feed doesn't need to be turned on. That's only if it's one of the aux outs. I'm in a band, so I am buddies with some soundguys around town, and most times I do ask. It's really not that tough to stealth though. Sbs at smaller venues are very accessible.
And for all of the people who think SBs suck, think again. You've got to pick your performer. If it's a band with huge, loud amps you probably won't get a good board tape (due to the mix, obviously)...but if shit is quiet and baffled properly, or you have an acoustic performer you can get some amazing recordings off of the board. I got a STUNNING Wide Mouth Mason stealth SB this summer that I completely treasure, and no, I haven't traded it, never mind sold it. There are no other tapers in this town, so don't you guys worry about me ruining it for others either.
Ever hear of live and let live boys?