Right hand turns should be slower then left because your load is always on the left side while traveling. When backed up to a pump, DO NOT LET THE PUMP SUCK AIR!, if you do and you have a pump operator that cares you will get a reaming and then the honor of hosing off your truck and the pump. I carried a pair of the yellow rubber boots, 3 or 4 sizes larger then my regular boots that way they slipped on and off over the regular boots, I also carried a nice Mag. trowel in my truck for those times I had to deal with a homeowner doing a pour. If you get to a job that's not ready for you yet, I always slowed my drum down as much as I could, so that the 'crete kept moving but not enough to beat it. A great flush at the end of the day is priceless, an occasional dose of stone in your drum at the end of the day if the dispatcher will do it will help you keep your drum clean. The cleaner the drum, the less you'll have to get out if you have to get in the drum. An automatic will make your life so easy, because the smoother the driver you are the better the contractors will like you, and with the auto you'll have it a bunch easier then with a manual. Walk any job you get on before driving it, and the pertinent question is where the septic tanks/ leach field, any other underground problem might be.
It's been 5 years since I've been in a mixer but I'm sure there'll be more I think of. Any questions just ask.