I have about 500 hours of PPL time in light singles and a few in light twins.
I've spent a couple of hours in a 738 sim.
Two out of six of my landings would definitely have been crashes. One was really smooth, but we would've gone off the end if I hadn't overshot from touchdown. The others were rough. Rough enough to probably damage the aircraft.
In addition to the post above referring to CC training (use of O2, and ability to find the transmit button) consider the room in the flight deck. Small captain, if he/she can fit behind the seat.