DO be aware of how you appear to others. DO be aware of what stereotypes of gun owners antis and on-the-fence types have and DON'T be that stereotype.
I'm reminded of some pictures someone posted a while back on THR of an "Open Carry March" or something of that sort. And in just about every photo all I saw was camo, tac vests, beer guts, confederate flags, and right-wing t shirts. Now I'm a very right-wing guy myself, and own a lot of camo and tactical gear as well. But people need to be aware of how the outside sees gun owners. If you look you would fit right in at some racist militia rally, PLEASE do not mention RKBA to people. That image harms us. Whenever I open carry, I make a point to where nice clothes, and shave. Not a suit or anything, just nice khaki pants and a non-descript shirt. I want people to think "he looks like a nice polite young man" LONG before they notice the gun. I don't even have to talk to someone. They can just see me getting gas at the local Citgo. But if I can get just one person to think to themselves "I guess not all gun owners are backwards rednecks" than I think I've helped the cause.