Wow, old thread! lol
I ended up going about a year ago. I just showed up early and got in line for standby, I didn't register. I forget how early I went (at least a few hours) but the standby line was already pretty long! People were just chillin on the ground along the walkway, eating, reading, zoning out with their ipods. Yes the classes were PACKED! You could hardly move in there. They said they normally try to take everyone who shows up, so as long as you're not in the last 10-20 people, I think it's guaranteed you can get in on standby. This time they had a particularly large number of people on standby.
I have gone hunting a few times since then, for sheep and deer on Lana'i. Can't say the class really prepared me that well lol. I mean, I certainly learned some important basics in safety, etiquette, and law. I had no friggin idea what I was doing when I was cleaning and skinning my animals though. Thankfully I was with hunters who walked me through it. AND thankfully I was prepared with a razor sharp skinner.