Thanks guys, that's helpful already. To answer the above question, I'm ABOUT 40 years old and weigh 180. I have done a lot of mountain biking, (um, more than 20 years worth?) which has taught me "reading the trail" and looking ahead, etc, even though my first dirtbike ride made it clear there are big differences, too.
I also spent a full summer on a street bike riding 2-up with my girlfriend (er, now wife of 15 years). And I mean a FULL summer - we rode all day every day, slept in a tent wherever, and covered just about the whole USA - man, that was fun - so clutching, braking, and throttle stuff does still have some muscle memory, and the differences on a dirtbike (clutch fanning, for instance) have seemed easy enough to learn so far.
Yeah, "good sense" taking it slow, and forming good habits are all solid advice that's worked for me in many other "arenas" -so I'm glad to hear folks feel it applies here -
whoo hoo!