Cleaning Lionfish
The spines to be most mindful of are the long dorsal spines along the back of the fish. Begin removing the dorsal spines by cutting into the flesh along each side of the row of spines moving towards the tail.
After loosening the spines pry them off completely.
Remove the anal and pelvic spines by cutting from the base and remove the cartilaginous ventral fins.
These are not venomous. The scales on the Lionfish are quite small and easily removed in the usual way. Fillet the fish as usual.
With smaller fish, it would be simpler to remove the spines by snipping them with kitchen shears or clippers.