Mark,
You are right about needing to keep track of the profiles. I chose to add codes to my personal genealogy on my PC showing both the Wikitree ID and a status when I had completed the edit. A second step is that you can sort your watch list in edit date order - after you have completed edits on those that you have imported you can check the edit date to be sure you have not missed any - this last step will not cover all of your work but may high light ones that you might have missed.