They just want to be sure that you are a level-headed, well-trained, productive member of society. People make the first judgement often by just looking at you. IT IS IMPORTANT TO DRESS PROPERLY!!
So, I suggest wearing a tie (bow-ties are non-intimidating). Obviously, put on your best dress shirt (be sure to cut off the sleeves, so you aren't concealing "the big guns" without a permit) and a pair of cowboy boots (because John Wayne was a cowboy and cowboys know handle a gun).
Then put on some 'Nam era fatigue pants to imply military service too. Lastly, complete the ensemble with a proper hat. I suggest a stylish (yet practical) Top-hat. A simple black one like Honest Abe or a patriotic striped Uncle Sam would work well too. If you don't have a top-hat, dump a jar of flour on your hair to replicate a powdered-wig like the Founding Fathers wore in 1776.
During the interview, they will try and ask you misleading questions. They are trying to find a reason to deny you. Answer every question in a calm and well articulated fashion. Don't rush when speaking and pause often, in case they have a follow-up question. (Think William Shatner performing Rocket Man.) Also, be sure to be as "politically correct" as possible. Try and say things like "Native-American" instead of "Indian." The exception of course is Gypsies. In fact, "Thievin' Gypsies" is a good answer, should you be asked, why you need to travel with a gun?
Most importantly, remember this is a group of government APPOINTED people who are paid a high salary (with your tax dollars) to do nothing but waste your time. Be sure to remind them that they "work for you" and you're REALLY to busy to sit around and "play monkey-football with them all afternoon" because you ACTUALLY WORK FOR LIVING.
Depending on your state and local procedures, the board may give you their decision via the mail. Politely, tell them that you "Ain't got time for the postman, quit being cheapskates and send the letter via UPS/FedEx because it's on YOUR dime, ANYWAY."
Lastly, I suggest you thank them for the meeting and ask "don't I get a free sack-lunch like you do on jury duty?" If they reply "no", DEMAND they at least split THEIR pudding cup with you.
At this point, the decision of whether or not to deny your constitutional rights, is up to them. Hopefully, I was able to give you this advice before your meeting with them. I am sure everything will go smoothly as possible.