
I laid everything out: needles, alcohol swabs, and M2 vial. I set the vial on top of an ice cube to keep it cool.
The process is not difficult: uncap needle, inject 10 units air into M2 vial, turn vial upside-down, withdraw 10 units liquid, recap needle and place in freezer bag.
It is difficult to withdraw the last bit of liquid. Here’s the troublesome amount I had left at the end:

I did end up getting it though, so no worries. It turned out to be exactly 5 units, which is nice because the others all had 10 units, so it was exactly half.
When finished, I had 18 10-unit needles (plus the 5-unit one):

Calculation:
10 mg / 18.5 = 0.5405 mg per dose (except for the 5-unit dose, which is half that.)
Damn. I was planning on doses of 0.25 mg, but since I used too little water to reconstitute, my doses will be 0.5 mg.
I’m going to take the 5-unit dose first, which is ~0.25 mg, and see how that goes.