Before modifying any gun, I would make sure that I was shooting to the capability of the gun.
In other words, is the gun holding you back?
Most people, myself included, don't shoot well enough that a gun holds them back.
If your form, follow through, etc. are so good that the only thing that is slowing you down/throwing shot groups is the trigger of the gun, I would definitely change it.
Most people are not. Particularly people who are new to a platform.
Of course YMMV.
* As a Certified Glock armorer I am not allowed to use or condone the use of non-OEM parts.