If those are the small packs of Munton's yeast (5g, I think) I'd use two packages for good measure.
Also, while clean is never a bad thing, during setup and boil stuff doesn't really need to be sanitized because the hot wort takes care of that. Of course, anything after flameout and the wort cooling/cooled needs to be sanitized.
Drinking: Craptastic Cream Ale
Primary: Scottish Wee Heavy