I don't know specifically for that airport, but you should know that a patdown is always something that *could* happen, so it's a good idea to let everyone know what to do and how to act if someone is asked to have a patdown. (or if they have the new scanners and you don't want to take part in them, which then will cause them to do a patdown instead...that said, I've noticed that the airports I've been through in the last year or so will not send a family to the new scanner line in the first place).
I personally have never had a bad experience with patdowns; it's always quick, to the point, and simple.
With the metal detectors it's important to not touch any part of them. So if your kids are little, make sure they know not to run through them, or brush against them.
Have a plan on what order to go through; we put DS in between us (though he's 8 now and an experienced traveler, so it's not as worrisome if he's ahead or behind us...but it still makes us feel better if he's between us when all 3 of us are traveling). We know what we have to take off and put in bins (kids under 12 don't have to take off shoes anymore). If we aren't totally sure, we ask (some airports have, or don't have, rules that other airports don't/do).
While I've been irked a few times with TSA (the one who ran a bag through the machine 5 times before finally asking if she could open a pocket, because she was confused by the pack of batteries in the pocket...the metal detector that apparently was cranked to "11" because it buzzed because of DH's shorts zipper and then my normal-sized Goody-brand barrette...the TSA people who were about to send me back to be checked out, while DH was already back there, and were forgetting about my then 3 year old standing there...), nothing has ever happened *to us* that has been traumatic, or not easily taken care of (lady behind me reminded me of my barrette, which solved that problem as well as the leaving 3 year old behind problem).
We get to the airport in PLENTY of time. We try hard to not rush. We make sure we have nothing in our bags that isn't supposed to be there. We smile. We let TSA people do their jobs (like the guy that was trying to restock the bins and no one was letting him in, while at the same time complaining that there were no bins...we let him in and he was so happy with us).
I hope that helps, even though it's not specific to Sanford.
Oh, and very important...if they are concerned by something in your bag, do NOT try to physically point out where to look, or *touch* your bag! Man do they hate that. I have a Rio MP3 player, looks NOTHING like an ipod or anything they are used to now, and it has caused concern more than once. Now I just *tell* them where it is and what it is...with my hands firmly at my sides. The first time I tried to get involved, and they got so scared and nervous it cured me of that need to physically show them where it was.