Initially,I had great problems keeping straight on the runway when taxiing,I even tried using the yoke as steering wheel!
Then they let me play about taxiing for 20 mins or so, when they were not busy,and that cracked it.
Best thing was they didn't charge me!
Same as the taildragger course,first of all lots of over input with controls and then suddenley you get it,or most of it
Good luck
Lister