Growing up hustling pool on bar tables in New Orleans, I found that playing left handed gave me just the edge I needed to seem a little awkward, but at the same time be able to utilize the superior mental and intellectual edge over lesser skilled opponents. Soon, if I could beat an opponent (or even a tournament) left handed, I played left handed.
There is usually ample time in an evening in-between shots when you can practice stroking left-handed. While sitting in the chair, spend most of your free time with the cue left-handed, "air stroking." If you do this for any length of time (and you are going to be playing for years to come, right?), eventually you may become unaware of the difference between the two hands. The only difference I feel now is the adjustment of my head and dominant eye (which is a major component.)
If perfect practice makes perfect, then use your down time in between innings efficiently learning. Muscle memory and neuro connections will be built over time, IF you are consistent and disciplined enough to work at it.
I've spent HOURS doing spot shots. One right handed, one left handed, side rail then middle table. Bank pool practice left handed. One pocket action with lesser players, but giving them the opposite handed spot, or switch hands each shot spot. BET SOMETHING, if you're gambing, you'll focus more and force yourself to improve left handed. $2 a game 9-ball with a lesser player, will get you frustrated at first, it will even make your shoulder tired, but it will improve your consistency with your stroke being straight as well as give you an opportunity to sure up your bridge hand. Make that bridge wide, open handed at first. Don't try to do anything fancy with the cue ball. Just make the shot. If you can't hit center ball and take the tangent, what good is it?
My best was when I moved to Memphis and was practicing banks left handed for about an hour and one of the locals asked me to play some $50 a game banks. I won the first one (lefty) and he won the second. I switched back to right handed, and in the middle of the game he noticed and said, "oh crap, you're right handed aren't you? I've been watching you for an hour playing left handed, huh?" YEP. You know, he beat me anyway. I love pool! Thanks Billy!
Raise the bet! I HATE POOL FOR FREE!