take the callipers off, leave the pads in and pump the pistons out with the brake lever. this usually get the pistons out enough so you can wiggle them out. if not then take another pad out then do the same. be careful that the pistons dont pop out.
you need both pistons to be pumped out far enough to wiggle them free. if you dont use a 'shim' like the pads and you pump the pistons out then you might only pump one of them. having a 'shim' makes it so when one piston reaches full extension the extra pressure will force the other one out, if you get what i mean.
this is the cheepest kit i can find
http://www.ebay.co.uk/itm/Suzuki-SV-...MAAMXQBwlRUaUo