Brandishing is basically pointing your gun in a dangerous, stupid, or threatening matter. Leave it in a holster, and you've got nothing big to worry about if you don't break any laws. The only people I know of who have gotten plastered by illegal prosecution didn't have CPL's.
So your advantage is a CPL. There is a chance that if you OC you'll get stopped and bitched at by a jerk cop, especially if you do it a lot, but it's extremely unlikely that you'd get in any form of trouble. But since you have that CPL, you can OC as much or as little as you'd want, or you can casually conceal like you mentioned. Doesn't even hurt to do your first bout of open carrying at a meeting, since that feels the safest for most people. Or you can even decide against ever OCing. The number one suggestion of people here is to carry, OCing is optional.