The Vickers Tactical Carry Trigger (Flat Face Trigger by Tango Down) for the Gen 5 Glock is an amazing affordable upgrade. While the packaging expressly states that you should probably have a certified Glock armorer install the trigger, it is really pretty simple.
To install the trigger yourself, you will need a small punch and a hammer of some sort at minimum. Add a little patience and mechanical ability and you’re golden.
You can find the Vickers Tactical Flat Face Trigger here.