If you're worried about a blowout, fit the fermenter with a blowoff tube instead of an airlock for the first couple days. You can switch back to airlock if you need to after the initial krausen has settled, just make sure everything has been sanitized before you mess with it.
"Without a doubt the single and most dramatically significant thing that can spoil the taste of your beer is...worrying." -C. Papazian
Primary: Hefewiezen II
Bottled: Viginti Irish Red, Deception Cream Stout, EdWort's Apfelwein
Drinking: Deception Cream Stout, Apfelwein