If I had known that asking whether or not to hire a trainer would spark this kind of debate, I'd have done it months ago. This has been the best read on the Training board in many months.....it's good to see discussion on something other than "How do I peak my biceps?" now and then. Kudos to all participants.....even you btrue!!
For what it's worth, I'll throw in my .02 on the lat/tri/bench thing. I'm 34 yo, 6'1", 215-220, natural, lifting for eight years. Every lifter has muscle groups that grow and strengthen faster than others...mine are tris and lats. These particular muscle groups are proportionately larger and stronger than any other. I do unusually heavy excercises (for me anyway) for both these muscle groups. The thing is, I couldn't bench my way out of a paper bag. My max is about 275 bar, 100 db.
As for scientific knowledge vs experience. I look at it completely differently than most here. My knowledge is base primarily on my experience in the gym. So, I feel that makes me an expert on one thing only; that is what works for ME! If my time permitted, I would LOVE to have the scientific knowledge of a bignate or some of the other folks on this board. It's beyond me how some of you could think that kind of education is somehow detirmental.