Bought my drysuit and the store gave me a package to take home. I'm padi certified, but this store was SSI. So, I took it home, read the little book, watched a video, did a test and went back to the store the next weekend. After that, we took the suit to the local pool and just played around. I had a DM helping me one on one. The next day, she took me to a lake around here and we did a 40 minute dive to about 40ft. No exercises in the lake, just a dive so I could get used to it. After that, I pretty much taught myself with tips from my friends. But, I do have to say, its pretty darn easy. Just add air when it squeezes or you feel a bit cold. As long as you make slow acsents, you will give the air plenty of time to reach the exhaust. Good luck with your new suit!
Nalidixic