depends on the gun on most you 'drift" (using punch and hammer) the old sights out the dove tail and "drift" in the new sights its easier with a sight pusher

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There are several inexpensive sight change tools so you won't marr your sights or slide that are easy to use. ---: youtube.com/watch?v=9NfXJhTX1x0 ------- : amazon.com/Sight-Master-Pusher-Tool-T1003/dp/B00BD65Y4C

here is a you tube on how to do it with minimal tools youtube.com/watch?v=ce3nRI_mS9k