I couldn’t count how many. I worked in a shop for 5 years, certified by Marker and Salomon, and trained for a bunch of touring bindings. And I’ve mounted a whole bunch of alpine, touring, and tele bindings for friends at home since then. Even one or two people from this site. Never had a failure. Even corrected a couple bad mounts that other people did.
As I posted earlier I find a drill press makes it easier, faster, very accurate, and much less stressful for my home mounts. Maybe I’d be a little more pedantic if I’d worked in a shop longer?
Edit: Have you done many home mounts,
@Uncle-A?