You have to wait until it airs in America. Sucks mate but that's the way the cookie crumbles. If I recall over the air America is a few episodes behind. I do my stuff thru the grey market which I won't detail here out of respect.
No you don't. I'm american too and I watched it on iwatchdoctorwho.com. I watched it on there just after it aired. Just make to to find a good version on the site, they have a few links but they have good ones