Trans rebuild?

You can do it! I've done it on the floor of my shop and/or work bench. No special fixtures required. Only one special too needed and I made it out of a block of wood and a piece of threaded rod. The tool required is used to compress one of the clutch packs in order to remove the clutch pack springs. You may need a slide hammer to pull the front pump.

A service manual will give you specs for clearances and remind you of the order in which things need to go in.

The nice thing is that the guts come out and go back in in "chunks". Tear down and reassembly go fairly fast. It's getting everything properly cleaned up that can be time consuming so a parts washer is a bonus. I degrease the case with a pressure washer and chemicals. The shops have a washing maching for this.