Pull the wheels, take the calipers off, press the pistons in (round part with rubber boot on caliper) either use c clamp or caliper tool. Install new pads, put together.
Suck brake fluid out of master cyl, refill with new. Crack bleeders on wheel cyl and calipers. Leave it drip (gravity bleed) until the fluid is clear. Make sure master cyl doesnt go dry.
Easy method, if you have no experience, take it to a shop.