I did my fronts recently and it was a doddle. There are a few do`s and don`ts though. Do use axle stands as well as a trolley jack, don`t use anything hard or sharp to push the pistons back, as you could slip and damage the dust seals (wood or plastic is ideal), do check that after pushing the pistons back your fluid reservoir hasn`t been sick on your paintwork, do start the engine and pump the brake pedal until you get good resistance and lastly don`t expect your braking to be 100% instantly, drive carefully until the pads have had a chance to bed in to the contours of the discs;)