Try carrying a CC cross bow, then tell me about comfortable. Arrrrrr....
Or, I have my butler carry for me.
Actually from what I have read, it's easier for us "big guys" to carry concealed. I carry my XDsc in a Kholster for HOURS comfortably. I have gone almost 12 hours with it. The keys I have found for me are:
Position: 4 o'clock
Good belt
Pants that are slightly too big (by about one size)
I also OC a bit, usually when it is just a quick trip and thrown on my paddle holster.
Edit: Someone once said: "Carrying is supposed to be comforting, not comfortable."
..but I think it can be both.
Carry concealed is comforting, not comfortable.
But anything you can do make it more comfortable is a good thing, provided it's not at the expense of good tactics or mechanics when drawing the gun.