If we knew some more facts abou tyou, it would a lot easier to tell you what to expect. Where do you live? How old are you? What sort of neighborhood do you live in? What do you look like?
All these factors can influence how you are perceived (and therefore treated) by LEOs. It probably shouldn't be that way, but it is.
For instance, I'm 44, white, have short hair, and wear button down shirts most of the time. I carry a .45 in a Serpa, so a lot of folks (citizens and LEOs) assume that I'm a cop, and therefore I don't get hassled. In fact I had an off-duty Deputy ask me a few weeks ago if I was new on the force here in Washington. I live in a small town, in a rural region, where gun ownership and pro-2A sentiments are the norm.
However, if you live in one of the larger cities, or are a minority, or are young (under 35) or have long hair or a lot of tattoos, you might get more "attention" from LEOs. That's not right, but unfortunately that's teh way it is.
Going about your business while OCing can be made a LOT smoother if you look "normal" or are with a "family". When I fist started OCing, I would often go with my wife and/or stepdaughter. Also, I was a "known entity" with local merchants and local LEOs for about a year before I started OCing, and had developed a reputation as polite, professional, and an upstanding guy. If people already know you as a "good guy", they generally won't be worried when they see you with a gun on your hip.
If folks don't know you, and you show up with a gun on your hip, that's when things can sometimes get a little squirrelly...
If you're still unsure about OCing, I'd suggest hooking up with some other local OCers at one of the OC Meetup Dinners. The schedule for Dinners is sort of drying up right now because of the holidays, but things should pick up after the new year...
And study the laws here in NC. The NC Attorney Generals website has a downloadable PDF with all the NC firearms laws, and that is a good place to start. Also, you need to know your rights, which you can learn from the other members here. There are a lot of good people on here, and the knowledge base that is available on this site is extensive. Just ask lots of questions, and we'll try and give you answers, or pont you toward sources of answers.
Good luck, and welcome to the world of OC.