If you have the sense the materials are slap-dash, so might the process be. If on the other hand, the materials are instructive, relevant and well put together, it's more likely the mediator's process also will be. Good mediators recommend that attorneys for both parties review the agreement, a Memorandum of Understanding, before it is signed. This assures you protection from any legal oversights during the mediation. Mediators frequently can supply clients with a list of mediation-friendly attorneys who will protect you from those legal oversights without undermining your choice to collaboratively negotiate.
Divorce is never fun.
If you are uncomfortable with a mediator, for any reason, you should seek another one. This made us both quite angry and the mediator didn't seem to be clueing in. A Guide to Help Divorcing Couples Find a Competent Mediator by Diane Neumann Home Misc.