First, buy this book: http://www.amazon.com/gp/product/089...Fencoding=UTF8

It depends on how extensive of a kit and what is wrong with your transmission. Most kits don't come with bearings and such and none com with front pumps. I recently rebuilt my TH350. I used the Hughes kit that does come with bushings. I used a chisel to remove the old bushings and made some bushing drivers out of some cheap sockets I had laying around. The pistons that operate the clutches can, with the exception of one, be removed with c-clamps. The one on the rear of the case required a special tool. I made one using parts of a harmonic damper pulley, some bolts, a piece of a turnbuckle, and a big washer. You will have to assemble the transmission sever times because you have to select the correct thickness of thrust bearings to put in the transmission. All of this will make your transmission like new. It was very high up on the difficulty scale, especially cutting out bushings with a chisel. I didn't need to change any bearings except for the bearing between the front pump housing and torque converter. You may not need to change any at all. In that case, to freshen up a transmission with new clutches and no hard parts isn't particularly difficult. I also had to replace my front planetary set.