I've done 30+ at a major carrier's stores and found them really easy after the first one was under my belt. I consider it easy money to do a route of them. Like BlessYa is with her gas staton shops, I am with these.
I developed a work flow for the photos and knocked them out quickly at the stores. I took them in the order in which they were wanted on the reports, then renamed them in batches by assignment ID. Some shoppers report they've never in a couple years renamed files and never had a hiccup from three MSC, but I like to do so for my records.