level of difficulty:
Guitarists sometimes replace their stock pickups in the hope of improving their guitar's tone. This step by step guide shows you how to swap your existing guitar-pickups for new ones.
The instructable is written by John Smith who changed the bridge pickup on his Squier Telecaster to a Seymour Duncan Little '59 in the hope of a more Les Paul type of sound. But the same technique should be equally useful for other guitars.
The problem I found with swapping pickups is that it's difficult to objectively compare the tone before-and-after, especially if you change your strings at the same time.