Thanks for the instructions. I would just add a couple of additional points of clarification from when I just ran through it.
For step 11 you hit the enter key on the Droid Pro physical keybaord after you select the option with the volume rockers to apply the update.zip
For step 12 there is LOTS of text that scrolls up on the screen and can be hard to read. Eventually it will indicate that its done and will highlight the reboot system now line (blue text). It takes a while to update so be patient. To reboot you once again hit the enter key on the physical keyboard to select that option that was highlighted.
The first boot takes longer than normal so again be patient
Other than these points of clarification the instructions worked like a charm on a stock device that was previously running the 3.8.7 stock release. Gingerbread booted right up and seems to be working fine.