Learned to drive on a tractor, Farmall 140, at age 5. Didn't take it out on public road until a seasoned veteran at age 7. When it came time for driver's ed my teacher put us in a 1978 Pontiac Trans Am. Drove the first day and last. Had to ride in the back all the rest of time. It was OK had two very pretty young ladies in the car with me. First car was three on the tree straight gear. If you can drive that you can drive anything.Do you have (or have access to) a long driveway? My dad gave me the keys to our Chevy Citation and told me to back it up to the road (about 40 yards) and pull forward to the house until I didn't stall out. Did that for hours and hours, days and days by myself. Once I had that mastered, then we went out on the road together. I still back up better than most people that I know! Oh, and also, have him start shifting gears for you when you drive. Helps him understand by listening the engine, when it's time to shift. (Yes, cat in a bag - he'll have to use his left hand to shift!) I did this for almost a year before I ever got behind the wheel!
Having said all that old people stuff, one of the most frightening things I have ever done is teach each of my three children to drive.