There are about ten zillion articles and posts on how to hire a good divorce lawyer. Zzzzzzzzzzz. Are they telling you anything you don't know? No. Are they helpful? Many of them are, if you actually follow them. Of course, most people hire someone who acts like they do, or acts they way they think a divorce lawyer should act. Or they hire the lawyer who represented their friend, family member or someone who was in the news.
In my travels on the Internet, I've seen a lot fewer posts on how to hire a good mediator. Caveat: I don't really like the mediation model. I don't think it works for most people, and I have yet to meet a mediator I think has done a first-rate job, although I know they're out there. (The AAML has a mediation group, so I'd look there, first and foremost, for the training, the skills and the knowledge base.)
I read a frustrated comment on Huff Post Divorce on this topic (in response to this post: http://www.huffingtonpost.com/beth-jones/how-to-hire-the-wrong-div_b_778906.html), to which I made the following brief reply:
"The role of divorce mediators is to find a meeting point, or common ground, to resolve differences (not to bring people together for the purpose of reconciliation, although that can happen when a couple sees that they CAN indeed work things out).