1. Remove screws connecting pickup to guitar.
2. Cut wires connecting pickup to guitar.
3. Solder wires to connect new pickup to guitar.
4. Return screws.

Though be careful with the wires, there are two of them.
Worst cast scenario: you realize you can't do it yourself after attempting to and have to get a tech to do it for you.
something better thna a stock squire one the noise is annoying and something with abit more a crunchy sound