It very easy. Done it to about four cars. Pump the back tires to about 50 psi. You don't want the itres to give when pressure is applied. Otherwise the tire gives, and the roll effect doesn't work as well. Start the bat at the back. As it starts to grab, push the bad down as another person idles the car forward. May need to give a little gas to get it rolling. Take your time. Roll it till it gets only as far as you need it, then stick it in reverse until it is back where you started. Repeat until it yeilds the rolls you want. If you want more, have a person sit on the edge of the quarter panel behind the tire. Sometimes you even have to jack up the body to get the bat in depending on the ride hieght.