Heh, I had lots of trouble with that mission too...
But whatever book you're reading is right, you've got to practice your flying skills.
Obviously, you haven't found the Dodo yet- or you would have already given up on this game.
It took me a ~very~ long time to beat that Dodo mission, too darn long IMO...
So, anyway- maybe you can get some hints for the RC plane mission from "fluxwildlyuncut's" Mission FAQ -->
Here
Frequent rain in Vice City?
Well, it does look alot like Florida doesn't it...
'luck to 'ya!