Whew! I spent Friday, Saturday and Sunday doing the League of American Bicyclists' training to be a "league certified instructor," so's I could teach folks how to ride their bikes with an official stamp of "she kinda maybe knows what she's doing" ... and insurance if you go out and get yourself killed and blame me (tho' I have to have covered the "need to know" stuff).
I almost passed, even Since I was carpooling, I had to bring my folding bike and... I didn't really get the emergency maneuvers down. (That also had a whole lot to do with the fact that I was exhausted and hungry by that third day -- food options were pathetic, and we were doing stuff 5-9 Friday, 9-9 Saturday and 9-4:30 Sunday... the road test was Sunday morning.) Everybody has to "team teach" twice with somebody already certified and I'm going to have to demonstrate those maneuvers before I teach 'em (there was no problem with my slow-mo walk-through and explanation...just the speedy execution of that instant turn).
I'd say that if a person wanted to do it, s/he shoudl make sure that at least some parts of the curriculum were automatic already. Since I'm a ride leader for a beginner level ride and daily commuter, the parts of the course where we were out on the road and supposed to "lead from the back" and tell people how to ride and where to go were second nature; even the "teachy" parts were things I did all the time. I'm not sure I wouldn't have just gotten too tired for words and gone home, otherwise -- it really is too much crammed into too little time unless you already know lots of it. That said, it woudl be worth getting to where chunks of the course were second nature...