Sometimes with a new trainer folks have a tendency to use to much of a mechanical advantage on the nosewheel steering and some ARF's have hardware (a nosewheel steering arm) that may not actually be long enough for the very soft steering that I usually suggest for a new learner.

After trying some of the others suggestions above do give some consideration to your steering linkage. Make sure the nosewheel pushrod is in the 'closest hole' at the servo and is in the hole furthest from the nosegear up front. The ability to do very tight 180 degree turns taxing is far less important to the begining flyer.

Don,t get to many Nexstars in this area but the last one I set up for someone was last week and if I remember correctly that it seemed as if the supplied nose wheel steeting arm was a bit short for easy steering even with the pushrod at the closest hole on the servo. Of course you can always reduce rudder response with electronic endpoint but that is not alway an option on your equipment.

John