At a small company, I once had to put together an big order of 150 PCs for a local college. A one-man assembly line - I had three cordless power screwdrivers. We had an 8-way hard-drive duplicator (I think it was called the Octopus) that we used to make the master HD image. I made a mistake on one of the network card drivers and had to boot up all 150 PCs and update the driver.manually. That taught me a lesson.