From Port Arthur. Coonass blood. Been eating crawfish since I could eat. Been cooking them since I could cook. Corps Ag is almost spot on for how I learned to do it. I always cook my corn and potatoes first/separate. Perfect thing to do while the boil gets ready.
Always dust. Definitely season the boil, but still dust. Perfect way to do it for those who like them spicy and those that do not. If you like them spicy, lick your fingers and suck the heads. More dust. If you don't like them spicy, don't lick your fingers. Less dust.
I also put garlic, onions, oranges, butter, and lemons in my boil. Texjoy shrimp/crab/crawfish boil. Prefer the dry boil, but the liquid boil is good too. Dust with the dry boil, or Tony's.
Don't overcook. That's what makes crawfish difficult to eat/peel. I add crawfish to boiling water. Return to boil and turn the fire off. Soak for 5-10 minutes (depends on how distracted I am and when I notice the steam coming out from underneath the lid). Put in cooler (NOT Yeti as previously mentioned. Frozen crawfish suck). If after a 5-10 minute soak they aren't spicy/flavorful enough, add more boil to the pot. If they are too spicy, maybe add some water and put more crawfish into the next batch.
Always make too much. When everyone is done eating, sit around the table, drink beer, listen to music, peel the tails (I still eat every 3-5 or so), and put into a container. You can freeze them in water and make etouffe or creole or cornbread later.
Lots of times I think I'm making too much and there isn't anything left for etouffe later. Win/win.
Damn I want crawfish now.