A tip for concealing that I just recently discovered. If you're going to conceal and haven't done so much, do it in small amounts. I have been carrying my gun concealed for about 9-10 hours a day for the last week or so and I am definitely feeling it. I was carrying front to the right in an IWB. It worked great and I could do any type of activity without it becoming apparent. No printing, no showing and it was fairly comfortable. The only problem is that my back is now killing me because my body was carrying itself differently without my trying to have it be. The lower right side of my back has apparently been doing something to try to make sure the gun stayed concealed without me knowingly doing it. It started a few days ago and hasn't gone away even though I haven't been concealing and just been resting recently.
So yeah, be careful not to overdo the conceal thing. It may not happen to everyone, but muscles tightening and doing "odd" things to compensate for the bulge you're trying to hide can hurt after a while...