Replacing the pickup or amp on an Esteban guitar is a relatively simple process that can be done at home with the right tools. Here are the steps on how to replace a pickup or amp on an Esteban guitar:
1. Remove the strings.
2. Remove the pickguard.
3. Disconnect the pickup wires from the guitar's electronics.
4. Remove the pickup from the guitar body.
5. Install the new pickup in the guitar body.
6. Connect the pickup wires to the guitar's electronics.
7. Replace the pickguard.
8. Replace the strings.
If you are not comfortable performing this repair yourself, you can take your guitar to a qualified guitar technician.