The pad swap is very straight forward, I would suggest using pad adhesive on the back of any front aftermarket pads to make sure they don't rattle. It's not a safety issue, just some times the pads will make noise which is very obvious in an electric car, you would never hear over the racket of an internal combustion Elise. I have adhesive if you need it, or I can supply G-Loc GS-1 pads already set up for the Roadster(same compound as 1521).