1) If you're not comfortable and competent shooting the gun, and don't trust the gun, don't carry it.
2) If the gun and holster are uncomfortable to carry, or you can't get comfortable carrying it, you probably won't. Which sorta defeats the purpose doesn't it?
The larger handguns have their purposes. I have some that I love, but in general concealed carry isn't easy with a them. I know all the arguments about bigger is better, but if it's uncomfortable to carry, you probably won't. Try to find a smaller, lighter weight handgun that is reliable and you can shoot well. You'll be more likely to find it comfortable to carry. Get to a range that has a large variety of rentals available. Most ranges will have some employees that can help if you tell them what you're trying to do. Narrow it down to two or three you like best and shoot at least a box of ammo through each. By then you'll probably have decided what's best for you. I think you'll be surprised at how ergonomic and easy to shoot some are, even those chambered in .45 ACP and 10 mm. That sounds like a lot of trouble but good handguns are not cheap, and it's your life that may be at stake.
We all have our favorites, but me telling you what is best for me doesn't mean it's best for you. And that goes for holsters too. Unfortunately finding the right holster is a trial-and-error process. I have a box full of holsters that I thought I'd like but didn't. I finally found two, one IWB that is tuckable and can also be ankle or pocket carried, and one OWB that can be worn with an untucked shirt (my favorite of all). In general I'm a minimalist. With them my mid-sized relatively lightweight pistol is so comfortable to carry that I virtually forget it's there. (BTW if the gun rubbing against skin is a problem, try wearing a "wife beater" undershirt. I don't find them uncomfortable even in Texas heat.)
Remember the goal is to find one you have confidence in and will carry.
Ken


