Pretty much the same as everyone else:
Barrel off MARKER to make it look less like a 'gun'.
Reg off bottle.
Copy of PGI in your hand luggage.
All other kit in main luggage.
Padlock on main luggage.
Warn airline before getting to airport.
In theory you batteries out of markers and hoppers... Customs don't like to hear things "whirring" in bags... makes them a little bit jumpy!
Some ballers have told check in and walked straight on to the plane with special bag handlers to treat your luggage better than usual.
Others (us) have told check in and then had the baggage handlers refuse to touch our luggage and us litterally running through the airport with the check in lady running us onto the plane minutes before it flew off.
Others who travel with markers regularly seem to not say a word to anyone and get straight on...
I think it all depends on who you get!
I would recommend calling the airline first and then staying schtumm at the check in desk!
Whatever you do...
Don't travel to Amsterdam with Monkey Love... EVER!!!