I'll give you a different perspective. I have a concealed carry license and had it for quite a while. I would carry in specific circumstances (out in the woods hiking a 44 Rem mag snub nose revolver in concealed carry so the tree huggers don't freak out; in areas where I was concerned about my safety a 357 Mag or 38 Special inside the waist belt holster; 45 m 1911-A1 small of back holster, FEG 9mm Mak PA-63 inside waist belt hoslter where concealment was important). I didn't carry every day. Concealment was very important to me as a lot of my clients would flip out if they knew I was carrying. Where I live the ultra liberals flip out and cause problems for those that carry openly.
I purchased a KelTec P3AT on a whim and now I pocket-holster carry everyday and up the caliber of things only when I go out in the deep woods or I feel I am putting myself in serious danger. I also carry when I watch TV at home at the end of the day. I feel much more like if I am every going to be attacked either while out and about or during a home invasion, I will have a firearm available to me.
I think it is important to find something that you are really going to carry.....all the time and then practice with that firearm to get completely comfortable with it. My advise is find something you can carry everyday and start with that, even if it is a .380 Auto.
Once you get comfortable carrying everyday, then you can look around for that next maybe a little more powerful firearm that isn't a big step up in concealment or weight. I have found that size and weight were surprisingly important to me in terms of daily concealed carry. The KelTek .380 is about as big as I am comfortable with on a daily carry, fancy clothes or blue jeans all day long basis. I have a variety of larger caliber handguns and I try them periodically, but keep coming back to the KelTek P3AT. I may, after a while longer, move up to one of the KelTec 9mm's, but that is not likely anytime soon.
Having said that, I don't feel it is a problem when I put on hiking boots to go in the woods to put a larger caliber handgun holster on. For me I think a P3AT is what I need for everyday carry. This is a personal decision and an important one that we all need to make.