Quoted from PinMonk:
If you have a #1 and #2 philips, if you'd double check which works best on the tiny screws on step 4, let me know. I'm pretty sure it was a #1 but I don't have a power supply on hand to check easily.
Quoted from jfesler:
I found that my number 2 for better even the tiny machine screws. Less likely to strip those heads.
@vireland:
Agree, just got done installing mine, a #1 will work, but a nice new #2 tip will work better.
You do need to make a couple of other corrections/additions:
For reference all nuts loosened/removed in Step 1 are 11/32"
Step 1 C: You only need to remove the bottom 2 R nuts to remove the lower power supply cover.
Step 2 A: You are actually unplugging connector CN1 and NOT CN6. I would also put this step before Step 1 C as it makes it easier to remove the left most nut R.