I just did mine and it wasn't hard at all and plenty of instructions on the web and will come with the kit also. $75 for the kit on ebay with tool and around $25 for a quart of fluid. I RECOMMEND 2 QTS OF FLUID just to replace all the old fluid. You won't see clear come out with just 1 qt.
Skeeter ZX225, Yamahammer 225, Ultrex 112 52", Lowrance HDS 9T's,