i very rarely change sights, only make adjustments.
but i still bought the Lyman sight tool, from Lyman, cheaper than from one of the usual online places i buy from.
i have only once now, had to replace a fiber optic rod in my Kimber, and did pretty good with that, using a good "old" Radio Shack soldering iron for the heat..
sometimes i buy gunsmithing tools, cuz i like tools (former mechanic, and Tim "the tool man" Taylor fan)
so passing by the tool isles at Home Depot, Lowe's, and my hardware stores are impossible.
but also, from time to time, i DO make some repairs, minor that they be, and i don't wanna hack or butcher my guns with improper tools.