you need to carry to become comfortable with it.... the idea is that the gun on your side is going to be like your wallet or car keys.... they are there but you don't give them much consideration.
Now I would never tell anyone to carry a gun they were not proficient with, and one they know functions reliably
That means a trip to the range when you get it and putting at least 100 rounds down range, getting the sight picture in relation to where the bullet hits down, doing tap rack and roll drills, mag swaps, etc.
It also means that your EDC or any carry gun has to be shot frequently to stay proficient.... going to the range, putting 3 mags down range, putting it in a cheap holster and thinking you are going to be able to deploy the weapon and come out on the good side is not a good strategy.
That being said, what experience you get on the range is nothing like what happens when you have to remove the gun from the holster in any situation where you are faced with using it or not. Hands shake, adrenaline flows, tunnel vision, etc etc etc all happen ... it takes a lot of training and a certain mindset to be able to instinctively get the gun out of the holster, on target and have the ability to pull the trigger knowing you are going to injure or KILL another human being. Lots of people claim they can do it, very few can... I would bet most of the proficient shooters on this forum can do it.
My best advice to you after you buy a gun and get comfortable and proficient with it, is to buy a holster and belt that make you comfortable with having the gun on your side.
When I got my first Glock, in 1991, I was not comfortable with it on my side. My EDC up til then was a S&W Model 13, or a model 36... I was not used to a semi, and I was carrying the Glock without one in the pipe. Not a good thing to do.
What got me comfortable with the gun was a good leather holster with a thumb break. Thumb break holsters have always been my personal choice, YMMV.
Once I got a holster I was comfortable with, the gun became comfortable to me. Guns, holsters and belts are a system that have to work well together.
Just make sure the gun stays concealed... and not "printing" if at all possible