I think everything that has been said is good, but I particularly agree with going back to your trainer. I started flying again this year after a long layoff and I have spent the whole summer learning to do everything possible with the trainer. I bought a well-used Kadet Mk II that has been beat up, so I'm not really afraid of crashing. Funny thing is, I've only had one minor crash.

Like Dennis said, start with loops. Anyone can do them, but they are fun and build confidence. Then rolls. They are a little trickier, particularly with a flat bottom airfoil. Then you start realizing you can do half a loop and then half a roll when you're at the top and you're turned back around the other direction. You don't realize it, but now you've done an Immelman (at least I think that's an Immelman, I may be wrong). Then start trying to do half a roll and see how long you can hold the plane inverted using down elevator. When you lose control inverted, just roll back over to normal flight.

By this point, you will have done three important things: 1) You will be completely familiar with your plane's orientation (i.e., when the plane is coming at you you will know to move the stick left to roll right) 3) controls will seem like second nature to you (you don't have to think "OK, I'm going to turn left, so I need to give a little left aileron and a little up elevator." You just do it) and 3) You will develop the confidence that you can recover your plane from almost any situation (as long as you're not too close to the ground)

Once you get to this point, you will be itching to start flying the 4*, because you realize that all the things you do with your trainer can be done so much easier and better with the 4* and you are no longer worried about crashing it.

I see know point in getting another plane between the trainer and the 4*. Just get everything you can out of your trainer. Have fun!

-Scott