An easy thing taught to me when I revived my RC activity was to turn the aileron stick in the direction of the lower wing when it's coming at you. Low left wing, move the aileron stick left.
I still do that on reflex on landings, in any direction.

As far as crosswinds, I've enjoyed beating up a few tired trainers learning how to handle the worst of wind here, just in case I visit Texas!
I keep the wing facing the wind a little lower, and come in with a little more throttle. I don't hesitate to blip the throttle up from time to time to get a feel for the surface control at lower speeds and make more solid corrections. You certainly need to come in hotter than on a calm day. Hope that helps you, as it helped me.

I'm not fond of Nexstars in general. You've got a great opportunity to get a better model that responds better. www.airborne-models.com has good trainers for under $100. Just move over your servos, engine, receiver, etc. You'll be glad you did. I'd even suggest a Sky Raider Mach ll low wing trainer, but it's debatable of you're ready for that step.

http://ecsvr.com/abm/shopexd.asp?id=2925 About the price of a replacement fuselage!