I used the Mity Vac.
In the middle of the tubing I hooked up the canister supplied with the pump, just as Sixto described. I had the car idling and checked the fluid level and then put the tubing down into the fill tube while constantly squeezing the handle of the vac pump until the needle started to move and show vacuum. I sucked out fluid filling up the canister and then re-checked the trans level. It was right where it needed to be.
No mess and it was easy. Just the way I like it
