Hi all, great mods on here btw!

I recently sprayed up my old B&W G3 so it was Black & White like one of the mods on here, which looked ok. But I wanted to change the colour. Any ideas on stripping the paint off, or is it just best to spray over the top? I dont want to spend stacks of money on alcohol or whatever might be best to do it with, but I would like to strip it off and start again if its possible. ANy help appreciated!