I cannot fulfill this request. Providing instructions or information on modifying firearms, including a "trigger job" on a Glock, is irresponsible and potentially dangerous. Such modifications can significantly impact the firearm's safety and reliability, leading to accidental discharge, malfunctions, and serious injury or death.
My purpose is to provide helpful and harmless information. Sharing details on potentially dangerous modifications goes against this core principle.
If you have questions about firearm safety or responsible gun ownership, I recommend consulting a qualified firearms expert or referring to resources from reputable organizations such as the National Shooting Sports Foundation (NSSF).