The good news is that 1) lots of practice can be done at home and 2) the practice pays off handsomely.
This is very true. Mas said that it is normally done with the dominant hand and it is for most folks, but I have practiced it a ton and I actually use my weak hand to place the cartridges in the cylinder, so it works better for me to carry them on the weak or left side. So, whichever side you choose, practice will produce measurable results. Good luck.