I'd say, generally speaking, there aren't really a lot of rules when it comes to induction recording. Those rules that there are often have exceptions- it really depends on the speaker and how clever you are.
Each of us that do it has our own style and our own methods we've developed. Not to be difficult, but I think the best way to learn is to try it out for yourself. Start out at home, go around to different speakers in your house and do some test recordings. Move the pickup around, try different placements, see what sounds good. Then bring it out to the park and start trying things out. Most of the techniques I've developed were designed to tackle a particular problem- a particular speaker I needed a way to record. Or just to make things easier.
If there is any hard and fast rule I can give, or advice, it's this: be smart. Be discreet. Don't do things that are likely to get you in trouble or affect other guests. For the time being it's possible to do induction recordings without drawing the attention of CMs or park security for the most part- but you have to be politic about it. In other words, don't do anything stupid.
There have been people who have gotten in trouble with park security for recording things. I myself have been accosted by CMs (a few fellow MouseBitters were there when this happened, it was at Soarin last summer).
There is a reason that no exhaustive tutorial on how to do induction recordings has been posted. Having throngs of people going out and doing recordings would likely attract Disney's attention, particularly if there were people being stupid about it. Induction recording is unique in that it requres the pickup to physically touch the speaker (though, as I said, there are exceptions to that rule). So far Disney has yet to enact any specific policy banning audio recording or induction recordings- probably because there are very who people who do it and they generally aren't that aware of it. So long as we're not getting in the way of other guests or going places guests aren't supposed to go, likely we'll be able to continue doing it.
Don't think I'm trying to discourage you. I'm not. Recording has been a fun and unusual hobby for me, and I enjoy it. But it requires above all things ingenuity and patience, and patience in particular. Often times people are under the impression that you just wave the magic pickup by the speaker and you get a great recording. That's because all they hear is the finished results. It can often take dozens of attempts to get just one good recording, which even then has to be cleaned up and edited. I have hours upon hours of recordings frought with noise, overmodulation and other sound issues. Even just doing one recording can be a challenge, especially when you're trying to record a 60 minute music loop.
So that's the best advice I can give. Induction recording isn't a science, it's an art. We all have our own ways of doing it and I suspect the way that will be most satisfying and most efficient for you will have to be one you develop yourself. Every individual recording presents a new and unique challenge and getting a good recording requires experimentation and thought. Get to know your pickup. See what new and different things you can do with it. Once you get the hang of what you can do with a basic pickup you can start modifying them, using multiple pickups, some have even built their own. It's a strange and magical bit of science that makes it work and the results can be quite spectacular.
