Harryangus,

Here you have a priceless advice.

There is no need to procrastinate the learning of rudder.
As a matter of fact, flying your Avistar as Gray Beard explains above will help you much more than using ailerons for rolls and elevator to ascend and descend.
Fly with throttle and rudder as much as possible and you will learn very fast.

The dihedral of any trainer allows rolling by using only rudder.
That is called coupling and is no good for all types of planes, but using it as a learning tool, it is a good way of creating the habit of using the rudder.

Practice, practice and practice,............and don't allow the fear of damaging or loosing a plane stop your learning process.

Wind is our friend and fierce crosswinds are just friendly challenges.

http://masportaviator.com/2004/02/27/using-the-rudder/