The lower rack was easy, it simply pulls out and the new one goes in. The upper rack takes a bit more time, but is also not difficult. It needs to go into the track and you have to remove the upper spray nozzle attachment, both can be done by hand without any tools. Over all, a simply do-it-yourself project, but the beauty is that for those who are not good at projects, there are videos you can watch to walk you through the process.