Also, after you have them on the spear, sometimes if you don't get a good hit on them, they may swim off, especially if the spear doesn't have little barbs on it. One way to keep them still while cutting the spines (the big frilliy ones are not venemonous and neither is the tail), is to stick your thumb in their mouth. The teeth aren't big enough to hurt you. Or you can grab em by the eyes. REEF.org has some good videos as does youtube. Happy Hunting.
Oh, almost no lionfish off the beach in Broward. The reefs are pretty well monitored by divers. You might find an odd one here or there, but I don't even carry my spear anymore on a beach dive.