Hi frankieve, I must apologise if my post came across as a little rude, that was not my intention.
Firstly, no, you are not way over your head, like anything once you learn the basic concepts the rest is easy. If you've programmed keyboards then this should be a snap. I think the biggest hurdle on setting up and running DMX devices for most of us is getting the addressing right for the devices. Once you get that part right, the rest is easy.
I don't have the American DJ DMX Operator but I do have a un-named equivalent DMX controller and after reading both manuals of each one (and others mind you) they seem to follow the same procedure in terms programming rules.
For the sake of being practical I found this site which is an excellent resource on learning everything you need to know about the DMX protocol. Its well worth a look;
http://www.dmx512-online.com/whats.html From not knowing nothing about DMX 3 months ago, in a short time I think I've become comfortable enough to program my own scanners now. Now programming scenes and chases with a controller takes a hell of a long time and something you cannot do when at a gig. I suggest you setup your rig at home and practise programming up a decent show before you take them out on the road.
Finally I'm not sure what manual you have, obviously the wrong one for your controller. The manual should go into detail on how to program scenes and chases. You can easily download it again from the AA site if you don't have the right one.
Good luck.
ROQ out.