I keep my extra mag on my right side, in a old multi-tool holder. The same same side as my carry, and use my right hand to change mags. I'm more confident / comfortable with my right hand doing it than my left. I can also shoot fairly well with my left hand.
which side do you change out with?
That's a great question! A lot of us forget that not everyone has had previous training or experience with quick reloading.
It's univerally taught in law enforcement, combat, and self-defense firearms training that you should continue to hold the firearm with your shooting hand while you eject the spent magazine with the thumb/finger of that hand.
Grab your spare with your off hand and insert it into the magazine well.
It's not hard to increase your confidence. It comes with practice. Try this drill. Take a few minutes every day and practice the new method.
Hold your unloaded
pistol over a padded surface like your couch to protect your mags from unintended damage.
With your shooting hand, press the mag release button and let the empty mag drop free. Let gravity do the work of removing the empty mag
With your off hand, grab your spare. Lay the index finger of that hand so it runs up and down the front side of the mag. This acts as a guide when you insert it in the mag well.
Insert the new mag into the mag well. Practice with empty
mags. Don't want any surprises here.
Repeat this 20 times. In two weeks, you'll have completed nearly 300 repetitions, and you'll be well on your way to processing the new muscle memory needed to make this work easily for you.
Remember to keep the firearm held up where you can see what you're doing. Let us know how you're doing with this drill.
Hope this helps.