Are your pullets laying yet? If they are, that will make introduction go easier. Are you set up to do a true quarantine? If so, then I recommend doing so, no matter how healthy these boys seem.
Can I ask why you are getting two, and not one? While "they say" that the ratio should be 1 male/10 females, that is an arbitrary number that is picked based on standards for high production breeder flocks. My EE roo has easily covered 24 pullets/hens with excellent fertility.
When you introduce them, I'd suggest that you do so when your girls are free ranging (if you are set up to free range). Be around to supervise, and don't intervene unless one gal is getting unduly picked on. First breedings by inexperienced cockerels can look pretty brutal, as they haven't established dominance, nor have they perfected their technique.