yeah open carry is not so bad. the only thing that ever makes me nervous is not having a holster with a thumb strap or a full flap holster. Other than that I really don't pay attention to anything around me. Now keep in mind their are some lunies out there so if you see someone acting weird around you I recommend to just move away from the weirdos. I had an incident at 7-11 where a guy while I was in line starting putting his head close to my holster while I was turned around. I mean within 2 feet while I was on the phone. Needless to say I turned around and asked him what the hell he was doing so close to me and I just left. Again just pay attention to your surrounding and you're fine with a good retention holster.
You shouldn't leave the HOUSE OCing unless you have a good retention holster! I'm rather fond of the SERPA CQC, but to each their own. Blackhawk has lots of different SERPAs for sale and many other manufacturers make good retention holsters that won't break the bank.
Here's the catch: You better PRACTICE, PRACTICE, PRACTICE your draw a hundred times a day/night until it becomes second nature. Don't even THINK about using one unless you know how it works in the dark, up-side down or after you've been spin around 5 times blindfolded like you're playing "Duck-Duck-Goose". It SHOULD be common sense, but I feel duty-bound to remind you:
NEVER practice with a loaded firearm. Unload it, check it 3 times (or as well as you need to to ensure it IS unloaded) and then proceed with your daily/nightly practice. Practice drawing from all possible positions and with different kinds of clothing. Practice drawing from the seated position in your car. Don't do this where others can see you or you will most certainly be getting a friendly visit from folks whose pistols are certainly loaded and are also very familiar with drawing their pistols. You don't want to practice with them. They won't have theirs unloaded and they want to continue the "practice session" to completion: handcuffs, lots of questions, asking you to watch your head as you sit uncomfortably in the back seat of their car with the puke-proof seats, floor and plexiglas... You get the picture. Practice somewhere in private.
Just my $.02 worth