We are planning on doing this soon ourselves. You can have the gravel delivered. Mark out the area you want the gravel and line it with weed barrier, cardboard boxes, shingles, anything to kill the grass. Add landscape timbers around the area to contain the gravel. Have the gravel dumped on top and spread it out. Wet it down well before you park on it. Also add some smooth pavers or treated 2x12's for the tires to rest on. Parking on gravel for extended periods of time is bad on tires.