If you list the year, make and model of the vehicle you're going to install them on, then someone with the same vehicle can probably tell you how difficult they are for your specific vehicle. Otherwise the answers may not have any real relevance.
My 2002 Jeep Wrangler took about 4 hours to install while I got sidetracked with moving the sprinklers around the lawn. You can probably do them yourself.
On edit - if you're thinking of Roadmaster, they have their instructions on line. The others may also. Pull down the ones for your toad and see how difficult they look to be.
Bill
