As far as taking it slow goes, the rough route I've planned only requires about 80km/day, so probably a lot less than that for the first few days, then hopefully make the time up later, I've got 40 days to play with, so hopefully timing shouldn't be too much of an issue. Experience wise, I do have some, ridden a friends dirt bike a handful of times, and have a cbt (not that that requires much ability...). As far as actually riding on a road in traffic, fine in a car, not a clue on a bike.
I've heard about the lexus issue, and to steer well clear of anyone in a range rover... I had considered thailand, but it's going to be the last time in a long while I'll have the time to do a trip like this, and for some reason it just doesn't appeal as much. Got some family history in vietnam as well.
Also, does anyone know where I can get a half decent road map of cambodia?