I disagree that those who carry should start with a small gun unless they are seasoned shooters who have not carried in the past for one reason or another. Small guns are not easy to shoot. Statistics tells us that most civilian gunfights happen within 10 yards. There are 1-3 attackers. Most of the time it is low light, not necessarily dark but low light like in a parking garage. When it is a shooting meaning only one person has a gun 1-3 shots are fired. When it is gunfight meaning more than one person is shoot the number of shots fired is the number of rounds in the mag. When you look at these factors a newer shooter with small gun is putting themselves at a huge disadvantage.
A good general benchmak for competency with the gun you carry is "The Test" made famous by Hackathorn, Vickers & Wison. This drill has to be run cold. Do not run it over and over again until you pass. No warm up. Get to the range and setup the target and run "The Test". Place a target with a B-8 target at 10 yards. You can shoot this from the low ready. It random on a timer and when it goes off draw and fire 10 rounds into that B-8 target. The goal is 10 rounds into the target in 10 seconds with nothing outside the black. Here is a video of Hackthron & LAV shooting "The Test."
So with an LCP you can drop that down to 7 seconds. That is a tough task for even a seasoned shooter. 10 in 10 with a Glock 19 with nothing outside the black is not as easy as you might think. So my point is that you are setting these new concealed carry holders up for possible failure if they have to use the gun. Not many people who are new to conceal carry will be able to get the 7 shots off in 7 seconds let along keep them in the black. If you let someone shoot "The Test" back to back first with a LCP or pocket gun and then a Glock 19 the targets will speak for themselves which is the more effective gun. Do you think that you can pass the test with a J frame or LCP?
I also completely disagree that caliber does not matter and that any gun even a 22Lr is better than nothing. If the caliber is too small and the gun is too hard to shoot the chances of it delivering a lethal hit is diminished. All scenarios are different and IMHO always having any gun is not always better. The presence of a gun can escalate an event and if the one you are carrying is not an effective defensive tool it will not serve you well if called upon. Tiny guns in tiny calibers give a false sense of security not real protection.
So with that said I personally always recommend the following when someone asks me about starting to concealed carry. I always ask what gun do you shoot best. Within reason I always recommend carrying that gun. If they say a longslide 1911 I recommend the next best shooting pistol LOL. Positive hits are the only ones that count. Accuracy is final if you are fast enough. Once they have picked the gun to carry here are my other recommendations. For handling and accuracy reasons I recommend a compact pistol in the range of a Glock G26-G19. Trigger type is up to the shooter.
- I then tell them get a good holster. It does not have to be an expensive holster but a good holster and be prepared to get a different one if it does not "fit" the user. Look for quality used holsters. What is perfect for me might not be perfect for you so lots of good gear gets sold in LNIB condition.
- Get a solid gun belt. It does not have to be leather but it has to be rock solid to serve as a foundation of your carry system.
- Wear the gun around the house to get used to it. Sit with it in the holster. Walk around and do your daily tasks. This will help you get used to its weight and how it feels.
- Do not worry about printing. If you live in a state that has open carry if you print or show the gun bending over you will not be in any trouble. If you are in a state without open carry then make sure your cover garment covers the gun when you bend over, reach up etc... People are not looking at you waist. If they see something under your shirt they will think its a cell phone, pocket knife flashlight etc but most people will never notice. The ones that do will no care.
- Don't touch or figit with the gun. Leave it alone. This is a big tell and if you find that you constantly need to adjust how the gun is riding you need a different belt or different holster.
- Go about your daily business as you always do and work on your situational awareness. Good situational awareness will help you avoid ever having to use the pistol you carry.
If someone starts with a tiny pistol too often people stay with that tiny pistol because it makes concealed carry too easy. Concealed carry should be a commitment IMHO because only when you treat it that way can you be proficient in it.