Lazlo.Arcadia wrote:
First & best piece of advice I can offer: Get to know the DM (if possible) before the campaign even starts. Many DM's run campaigns, adventure paths, modules, etc as written and are very "by the book". Others take a much more relaxed approach and tend towards house rules (or simply not strictly adhering to some of the more difficult rules) in order to follow a "as long as it makes a good story" approach. These are two VERY different DM's, and knowing which one yours is can make all the difference.
Secondly is the DM using any house rules? Any 3rd party variant material? Any House Rules?
Lastly ask you DM's advice.
Keep in mind that unless your game is a Pathfinder Society Organized GamePlay, any of the above may be a consideration.
I do know the DM pretty well. So I can say this, he generally runs the module as written, but isn't unreasonably strict with the rules. I did run a third party class the Mechamage from Thunderscape by him and he said I could play that. Only concern is that the d6 HD will make him to squishy for those early levels.