Ok, out of many, many and more years that I can mention I’ve never had to change a magazine release from right hand to left hand. Today I did. Watched multitudes of how to videos before trying. I was an equipment mechanic my earlier years and the videos made it look simple.
Ha, Ha, Ha, Ha, Ha. I wonder how many times those guys on the videos tried before they posted that one good video? I stopped trying the video ways and decided to try it my own way. Hey, I got it done what do you know.
Now my question is how many of you ever changed a magazine release from right hand to left or left to right?
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Installed 5, never changed one over…
Equipment mechanic…betting the tools you used were slightly bigger than needle nose pliers and a watchmakers screwdriver 
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I did it on all my handguns… except 1911 and 2011 where it is impossible to do.
I also started from watching YT videos before doing this on my firearms… but actually I never found it hard to do. Unfortunately each manufacturer gets different setup on mag buttons. 
The easiest is M&P - it has simple pin inside the grip which gives tension and works the same way on both sides. I’m changing this every week on my M&P-SIRT pistol (my son is lefty as me, but shoots right hand).
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I have done it on every pistol I could with exception to my 1911 that cannot be done. A pair of needle nose pliers and good lighting👍
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Never tried.
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No reason if not needed 
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Can’t help with the puzzle. My left-handed spouse preferred to learn to drop by trigger finger in order that all guns in the house (mostly mine) would operate the same. Although a reload under (non-competition) pressure seems pretty unlikely, having the entire fleet operate the same way seemed pretty smart for practice, and for duress.
Both of us need to shift our firing grips a bit to make a secure reload anyway, so it’s not like there is real time lost either way once the pattern is ingrained. Unilateral safeties are a bit more of a challenge.
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Nope never have… Yet! I suffered a bout with cellulitis in my dominant and shooting hand; which in the course of treatment caused 3 tendons to rupture. I had surgery and have about 80% of my before usage and strength. So I may in the future.
I have worked on my cz82’s Ambi release some. My favorite at the moment handgun, a Ruger P89 DC is Ambi already, and the decock is also.
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Did it on my WIFE’S EDC. Simple, toolless, operation on that particular weapon.
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I, too, spent decades in equipment repair; from sewing machines to printing presses to plastics processing equipment. I’ve never done one myself, but I just had it done by a local smith. The manufacturer recommended that I not try it myself since the process involved removing the trigger group. Normally I will tear into just about anything to make repairs, but I usually do that with stuff which is already broken. That way if I fail the situation hasn’t changed much – the thing is still broken. So, while it goes against my nature to do so, I had the smith take a look and he did the job for $15, so I won’t complain.
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