RE: how long on the trainer
Good question... but you're the only one who can answer that question. Do you feel ready to move on? Here's what I'd suggest. Set up your stick and get one of the instructors or more experienced guys to maiden it for you. Once they've got it airborne and trimmed out, you take it and see how you feel. If it's too much, hand it back to the instructor and let them land it. Put it away and come back to it later.
If on the other hand, you're OK with it... have some fun!
I think you'll probably be OK... may have to tone down the throws a bit.
Hope this helps.