What are some tips/advice to prevent roommate woes during the year?

I will be moving into a house with two other girls who happen to be good friends with each other. I don’t really know much about either girl. We will be in the same academic program. I have already had to concede to taking the smallest room for the same privileges and rent. But just from conversing with two girls, who seem completely averse to compromise, I am worried that this year is going to be impossible to get through.

Now what’s done is done. I cannot get out of the living situation so I want to try to make the best of it. What can I do and say to try to prevent conflict or resentment breaking out among us? I don’t want roommate stress to cause a distraction from academics. So when you know that the two people you are living with are incompatible and unwilling to cooperate, what steps would you take to ensure peace and help things run smoothly? How do you talk to two people who pretty much have their mind made up about everything and are going to team against you no matter what?

Additional info:
We already have a cleaning and garage schedule decided.

All advice is appreciated!