Here's a step-by-step account on how to remove the stock pickups and install new pickups on a Stratocaster-type guitar. It's based on how I installed my three Dimarzio pickups (DP100 Super Distortion: bridge, DP116 HS-2: middle, DP217 YJM: neck) on my strat-clone Yamaha Pacifica 112. Here it goes: