There are several options.
If you plan on adjusting and/or installing sights regularly (or even just 2-3 times), bite the bullet and get an MGW or similar sight pusher. Can usually find a used MGW for $80 or so.
If you have other uses for it, get a vise and some brass rod to make punches out of. Don't get a $20 table-top hobby vise as they are worthless for anything other than holding a model while you paint it. You can get a decent vise that will be good for many smithing and shop projects for $60 on up to several hundred. If you don't have a place to permanently mount it, you can mount it to a "24 or so section of 2x10 or 2x12 and then c-clamp that setup to a workbench, tailgate, kitchen counter, or table when you have projects.
If you won't do either, you can pay someone local to do it for you, but you might be looking at $50, which would get you well on your way to a decent pusher or a vise. Possibly by the second time and definitely by the third time you need to install or adjust sights, you will be ahead by purchasing your own. A local shop or smith should be able to help you. Many shops will install for free if you purchased the sights there.
You can send it to Trijicon and they will do a great job for you. Any adjustments will have to be done by you in the future, which, again, makes a good case for purchasing your own MGW or similar tool. The tool is also nice to have as you can throw it in a range bag easier than a vise and punches and fine tune your adjustments after installs.