The Extra, the Cub, the RV-4, IMO all not good planes to move to from your trainer if you're having trouble with nerves. If you are having trouble with takeoffs the Cub will be difficult as it has a tendency to tip stall if you jerk it off the ground too soon. Move to a low wing trainer like the Sig 4-Star first and that will get you set up perfect for all those other planes. I went from my trainer to a 4-Star to the GP Extra 300. I could never understand why my nerves were so jumpy for the first month on the Extra until I flew the 4-Star again and realized how well behaved it was compared to the Extra.

As far as being nervous, I just remind myself what my instructor said, ''What are you getting so nervous about? It's just a model, you're not in the thing.''