I think Al did a great job with the article and lays things out pretty straight-forward.
Alwyn Cosgrove had a similar two-part interview piece a while ago that also talks about the real world side of training:
I think being a trainer is, for some high school or college guys, almost like being a pro athlete (without the fame, glamour, or wealth) in the sense that they have an idealized version of what a sweet, cushy dream job it must be, but they don’t expect trudging through all the detail work required to get there.
We had a pretty long-running thread where trainers/members here on the site talked about work-related stuff. Might be worth skimming through that and seeing what you can pick out as useful:
http://www.T-Nation.com/free_online_forum/music_movies_girls_life/trainers_talking_shop