This.You need to create a list of pistols that you are interested in, then research that list until you assemble a "short list" once there find a LGS that rents those on the short list. Whichever one feels most comfortable and you shoot the most accurate will likely end up as your CCW.
I would ask yourself some questions along the way, how experienced a shooter am I, will I be willing to dedicate myself to practicing, will I be willing to seek out professional instruction. There are a great many variables which need to be addressed, some are, what is my physical stature which leads to how large a weapon will I be able to conceal another would be how much money is at hand to purchase, equip as in holster, practice and ammo -ammo is a big one. A suggestion would be to focus on 9mm, not that you have to ultimately end up with one but they are reasonable in price and the ammo is some of the cheapest and most available -at least where I am- they're also one of the easiest to shoot with very manageable recoil.
I would add this and this might be the single most important question to ask yourself, are you capable of shooting to kill another human being? If deep down you don't think you can DO NOT carry a concealed weapon, PERIOD!
Hope this helps...