Its easy. 1. get photoshop 2. get a dds plugin for photoshop ( since most of the reskin files are dds ) 3. put the reskin files, you just drag the file into PS( usually in model/vehicle folder , ex models/vehicle/fire department/rw.dds ) 4. make the reskin that you want. 5. save the file, in this case as dds. 6. put the dds file back to its original folder and overwrite the old one. DONE