What Hanz said. Practice carrying. This is not only so that you become used to it, as Hanz discussed, but also so that you can determine what works best for you. All of us who carry concealed on a regular basis have a large box of unused holsters. An unfortunate fact of life, as there is really no other way to do it.
As a woman you have a huge concealment advantage when you use a holster purse. If you use a purse you are tied to it though; can't just leave it laying about a friends house, especially with children about.
Make certain whatever holster system you use keeps the trigger guard covered. Draw and recovery have a high fumble factor and that's where 99% of ND's occur.
Keep practicing, and realize that nobody is noticing. Go to a good defensive pistol course (a la Gunsite, etc.).
If you are using pocket carry, remember to blade that side of your body away from huggers and kissers. If all else fails, and someone asks you what that "bump" is, our technological society now allows an easy out, "Oh, that's just my cellphone/pager/etc."
I've pulled the same trick as Hanz, but realized it and bunched my coat up next to me so nobody could see the weapon. Now that move is a standard part of my repertoire! One morning I was driving to work and had to stop to assist some elderly women with car trouble right at the end of my driveway. I got out of the car with no coat on, and without thinking either. The women didn't bat an eye, and neither did I. For all I know they didn't even notice (I wear behind the hip IWB), but then this is NH, after all [:)]