I have a new Stihl FS110 4-mix that I've used for 1 1/2 seasons and it runs alright but I believe it could use a tune up and run a little better. My local dealer charges $75 for a tune up and it's not running that bad to justify paying that. Is it difficult to do a tune up on these trimmers as I would like to learn how to do it myself at 75 bucks a pop. I'm no mechanic but I'm no idiot either, I'm just trying to figure out if it's worth looking into and learning how to tune them up or is it difficult/requires special tools and I should just suck it up and pay the dealer. Your input is greatly appreciated.