I never had any problems with the Kinkos employees the few times I went. If anything, I got "you're paying 4 bucks for THIS?!?!" looks from them. But overall they were pretty oblivious to what I was doing.

The only issue I had to deal with was actually getting them the files to print. The covers I was printing were over 2 mb, so I had to actually download them from the internet onto a Kinkos computer. But I don't see why it shouldn't be any harder than putting the files onto a cd and handing it to them to print the covers. Should be pretty easy.