It is unnecessarily complicated unless you know you have a real AT problem already.
I would do the first one and a half steps and stop, except replacing Z-1 with DW1, and instead of raising it on a lift, I would reach under the car without even jacking it up. Drain into a pan, pour that into an empty milk jug to estimate how much came out (should be between 3 and 4 qts somewhere). Then refill through the dipstick, using how much came out as something of a sanity check.
This way, the only tool is a 3/8" square drive ratchet, one drain bolt (I usually re-use the washer with no resulting leaks), and refilling through the dipstick requires a customized funnel. Very tough for something to go wrong with this plan, vs. the one in that link.
If you find the ATF looks dirtier than you'd like, I recommend to D+F again after a thousand miles, and at every oil change, etc. until it is as red as you like.
EDIT - also, noticing you are on your original AT, if your ATF is overdue for a change, I would be cautious about shocking the system with more than one back-to-back D+F right now. When new ATF goes in, it brings new additives, which may dissolve and loosen crud deposits, causing problems for your filter and system if too much breaks loose at once. You do have an external filter (like a Magnefine), right? If not, I'd definitely do that at the same time as your D+F.