Overall time should take anywhere between 1-2 hours. Like others have suggested, watch the video a few times, cut your front wheels left/right, and make sure to have the angled screwdriver.
I opted to go with metal washers (1/4" bolt size, 1.25" diameter) instead of the supplied plastic washers. After one of them cracked it was pretty hard to find replacement plastic washers (RA doesn't sell individual replacement parts).
I know that with metal washers you run the risk of doing more damage to your fender liners/bumpers if you clip your mud flaps against the curb. I'm just more cautious when parallel parking.