DallasDMac
Footballguy
It's actually fairly smooth. You get on in the order the boarding passes say to. Empty seats are for the taking. Full ones aren't. It isn't rocket science or anything. Never seen it cause any issue whatsoever. I wouldn't try it if I had a couple kids though. For me and the wife, it is fine. As for your boarding area, someone mentioned B above being risky. I have never had to sit in the middle with a B boarding pass ever.Random seats sound horrible and just asking for passengers to get into arguments/fights.