The front sight will just pull off, and the back sight can easily be nicked out with a punch, but get a nylon one so you don't damage the slide if it slips. If you can't find one, use brass just be careful. Plenty of YouTube videos out there to give good advice.
The other thing you have to be careful of, if you improvise with a punch, especially a brass one, is that you can crack the vial and ruin the sight. Use the right tool for the job, or pay someone to do it for you. Better to spend a few more bucks on installation than ruin a $100 sight and have to buy another one.
Tritium. Get brass punch set; search You Tube "How to ..." videos. Do it yourself. Saved $38 bucks. Installed 6.5mm Meprolights green/green on all my Glocks. U will definatly see ur gun in the dark.
Meprolight is my choice. Just my opinion. I have no experience with Trijicon. The gun stores I have bought them from have installed them for free on Glocks. Some time back I installed a Meprolight front blade on my Ruger SP101. The front blade is held in by a pin that has to be punched out and you have to drill through that hole to make a hole in your new sight. I looked at the Ruger forums prior to install for advice. A guy recommended wrapping plumbers tape liberally around the barrel and sight to prevent scratching the finish if your punch slipped. It worked like a charm. I could see doing that to drift the old rear sight off. Could also work on install 'till you get down to fine tuning the final location. Even then you could layer some on the side you are punching on. In lieu of the Glock sight tool.