Tire Iron BeadBrakR slide show - BestRest
Once you get to a point where you can't go any further, at the left insert a tire iron between the tire and the rim.  

Keep your left knee on the tire to prevent the bead from slipping

Once you get to a point where you can't go any further, at the left insert a tire iron between the tire and the rim.

Keep your left knee on the tire to prevent the bead from slipping