Label trays #1 (developer), #2 (stop), #3 (fix)...Rule 1 is to NEVER get a higher number solution into a lower number tray, including via wet hands!

Rule 2...never turn on room lights when any light sensitive material is not inside a light tight container

Rule 3...never ANY lights when unprocessed film in not inside a light tight container

I second what MattKing said, and Pinholemaster said particularly!