As Whirlygig and Nigel Osborne pointed out, the trim change can easily catch you off guard. I soloed in an Enstrom, later I learned when the instructor hops out beep toward the empty seat 3 seconds or so. My first solo pickup I translated left (left seat solo in the F28A) quite a bit before I got my act together. On the good side, if your instructor stays on the side he hopped out of, you probably won't run him/her over.
-- IFMU