The 5R55 is simpler than a 4L60E to me. Until you have it burned into memory, lay every piece as it comes out in order across a long table. When I pull anything out, using my right hand, I sit it down on the side that goes in. And I put my cell phone away and lock myself in my shop and don't stop until it's finished. The stop and go will screw you up. They're so easy, I wish I had started building transmissions instead of engines.