I think the nexstar is the easy one that is included on the free version. It is one that is used for the demo in the landing trainer. Make sure wind is 0 and dual rate switch is down. If you've "landed" in the grass and on any other part it may not be landing where you want , but keep practising. Pretty soon you'll be able to put it down right where you want. I'm no expert , but it sounds like you may be trying to fly too slow.

The plane getting real touchy is the confusing part. I'm going to do some and see if I can help you.