I'm about to finish my rotor-wing add-on, here is what I have learned.
1. Light touch on the stick.
2. Think about what you want the chopper to do and it will do it. Don't make a large input.
3. Hovering is a lot easier if you pick a point several hundred feet away from you outside the chopper and just stare at it.
4. Auto's are fun.
5. Don't "rotate" to climb out. The collective is your friend.
6. Take the doors off if you can. It doesn't matter if you're flying a Robbie, a Bell 206, a Schweizer , or a Brantly. Yank those doors and have a blast.