When I started my CFI training, the biggest hurdle I faced was geting
used to the right seat. The thing you mentioned about using the wrong
hand to use the radio and throttle happened to me too. My biggest
problem though, was coordination. I couldn't land the plane without
sideloading to save my life. I guess all the cues I got for lining
myself up was dependant on where I sat... After about 10 flights, and 6
or so flight hours later, I'm pretty well adjusted to it.