Carrying the P30L: for me, I carry inside the waistband at 6 o'clock (center of back) most of the time. A loose fitting T shirt or polo does fine for concealment; the thoughtfully curved, rounded, beveled, and smoothed shape of the P30L's slide and grip prevent any corners from making little telltale pointy bumps on the back of the shirt. I keep my belt tight so the handgun presses firmly into the curve of my back and the hang of the shirt off my shoulders keeps the shirt from bumping out and showing the gun. When carrying this way you have to remember to squat instead of bending at the waist when you want to pick something up or get down low; that's actually better for your back anyway and I am old enough that I need to think about that. When you sit down, especially in a car, make sure to tug up your shirt in back just a little so you don't sit on the tail of it, or else you will not be able to get to the gun quickly. I really like this for in the car because it is so easy to get to the gun without interference from the seatbelt; all I have to do is lean forward a bit and I can get to the gun without taking my other hand off the wheel.
Occasionally I do carry up front; if I am going someplace crowded where I am likely to get bumped into, for the most part. I have enough of a belly, sadly, that the gun disappears below the hang of the shirt off my middle. This can get rather uncomfortable when seated for long periods of time, and it was downright brutal when I rode some crazy roller coasters at an amusement park with my P30L in front. Also makes it much more difficult to get the gun out when seated, especially in the car with the seatbelt on. And I personally am a bit slower on the front draw than the back draw, and usually need both hands for the front draw while I can execute a one handed draw from the back with ease.
The holster itself is just a nylon bag type with straps on both sides for inserting the belt clips on either side for a variety of carrying options. You can even put two clips on the same side for added stability if you like, but I find one to be adequate as long as I keep my belt tight. A lot of the purists and tactical types will demand that nothing but leather or kydex will do. I know they have a lot of reasons and most of them are absolutely spot on, but I have a drawer full of leather and kydex I won't wear because I find it to be bulky, sweaty, and uncomfortable when worn inside the pants, and I just cannot find a way to adequately conceal a full size pistol outside the pants unless I am wearing a suit or jacket. The nylon breathes, abosorbs moisture, and feels at least to me like it gives up the gun a lot more easily on the draw. I keep the belt on tight enough so retention is not a problem; I have worn it jogging, cycling, and a lot of other vigorous activities. Lots of guys have reasons for carrying on the side too, at 3 o'clock, 4 o'clock and the like, and I am sure they also have a lot of valid reasons. For me, the big advantages of carrying at high noon or 6 o'clock are that I can get to the gun easily with either hand, and the shape (somewhat doughy) of my body does a good job of concealing the gun in these locations. I have seen a lot of guys with their guns at the sides who think they are well concealed, and to the untrained or distracted eye they are, but I can usually spot the asymmetric profile from the front or behind because I am always looking to see who else in the room besides me might have something under their shirt besides belly button lint.
There are lots of options out there, so don't take my word for it. Read up about all of them, talk to people you know, then try a few different things if possible to find out what works for you. The P30L is a great carry gun.
