Some of the best Tactical Sports YouTube videos are by abyss1232.
I thought I wanted to replace my plastic trigger due to it flexing. After I adjusted the post-travel, there was no more trigger flex when I fired, because since the trigger stops as soon as the pistol fired, I no longer had a tendency to keep pulling and flex the trigger. I adjusted the pre-travel as well, and got to like the trigger as is.
Plus, the adjustment screws tend to stay put, and not loosen and back out in a plastic trigger. So no need for thread locker.
For instructional videos, there is a great set by Scarlett Pistol in this CZ Gunsmithing section on this forum; however, they are not TS specific:
https://www.youtube.com/playlist?list=PLXTbIrAR76i20MrrKs45HbEgP3dwnE0MK