Welcome to (relative) gun freedom.
I moved to NH from Texas, which has a reputation as "gun friendly", but is actually very restrictive about carrying handguns. My daughter-in-law is from far western NY (the eastern shore of Erie), which as far from NYC regarding gun rights, as it is geographically. Even she has a bit of mental adjustment when it comes to the ease of carrying in NH.
I don't make a point to open carry in NH, but I also don't make any special effort to conceal. When the weather is warm enough to avoid any kind of jacket, I tend to take care to dress nicely. I can't avoid being an old fat white guy, but I can avoid looking like a scruffy slob, so I do. And because my "resting face" looks hostile (I once made a TSA agent recoil in fear without saying a word), I go out of my way to smile and give friendly greetings to everyone I meet.
As for proximity to the MA border, I'm at the far northern end of the state, but I did have occasion to visit the Pheasant Lane Mall in Nashua this past year. We stepped out the south door, and I pointed out to my daughter the line carved through the parking lot that denotes the line between relative freedom, and a felony.
We walked to our car as one of us was on one side of the line, and the other was across it. I won't say which was which.