Snap.I agree with Ely about the use of an uncapping fork. I personally prefer to uncap into an uncapping tray rather than over the extractor as I find whatever filters you use will clog up too fast and need cleaning too often when you have all the cappings going into the extractor.
As others have said cover all surfaces well and be prepared to get sticky. Use COLD water only for cleaning so you don't melt the wax.
Plan plenty of time for the session and enjoy it!