I also recommend going with a good fit, although I agree it can be difficult to figure out who really knows what.

I don't view "different schools of fit thought" as necessarily being a problem, because I don't believe there is one and only one fit that will actually work for you. Rather, there are a variety of positions that can work well.

One problem with the DIY approach is that you really can't do things like measure your knee angle all by yourself. You also can't really walk around yourself while riding to check your fit -- and might not know what you're looking for anyway.