The Mrs and I have the same generation (gen 4) and model Glocks. When we bought them they both came with the standard sights that don’t offer any illumination in low light conditions.
We had a sight pushing tool already so just bought new night sights. It’s an expensive tool now but cheaper ones can be bought for around $50. If I were to start over and didn’t have the tool I’d likely save money and just have a gun smith provide and install the new sights for a fee.
If you have one or can borrow one from a buddy it’s a simple process to push on a rear sight. The front sight does require a special tool to remove that can be bought for less than $10. It too is an easy job to replace and there are tons of YouTube videos that show you how.