It was quick - I applied, they called me back and asked me to come in for a half hour observation in a classroom. The classroom observation was fairly easy - you go into a class, usually while the kids have free time, you play with them and talk to the. Two of the things they really watch for are that you stay positioned so you can see the classroom pretty much at all times (so keep your back to the wall, reasonably) and that when talking to a kid you get down on their level and not tower over them. They called me back and offered me the job.