Yes, you get it in an infusion, every three weeks generally. It doesn't take long - maybe half an hour or so. The protocol is often to start you off with some chemotherapy to make it "kick in," though - usually Taxol. What's your insurance like? Lani on the board here is a wealth of information, as is Jackie, and they can probably give you links to the latest research that you could print up and show to your oncologist.
Here is an article to get you going.
http://www.breastcancer.org/risk/new...h/20091104.jsp
Don't be scared. With Herceptin now, HER2+ tumors are sometimes considered the best kind of breast cancer to get, because they're so treatable.