i fitted the rears with some large 'g' (type) clamps, they're not actual g clamps but the sort that slide along a bar and you then twist the handle to close them.
the fronts i just used my thumbs coz the side walls are much softer on car tyres!
the rears took a fair amount of effort prob bout 30-45 mins each, the fronts took about 10 mins the pair!!