you can get a sight pusher for like 35 bucks and it costs about as much as people ask to install them

i use this one https://www.amazon.com/gp/product/B01BZ7VYEW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

takes a bit of messing with and you might have to make some shims out of a wooden home depot paint stick for some guns but it does the job and is less scary than trying to drift with a punch