Anyone who has watched enough of this game understands the "any given Sunday" element the NFL brings and how no game is a sure thing no matter how bad the opponent. But that said I think the Rams fans in general need to get more used to having a GOOD team. By which definition they're going to beat the subpar opponents in most cases.
They had a scare vs the 9ers, who rose up to give them all they could handle. For many teams that would have been an any given Sunday upset, but this team took care of business. This is a good team and there's really no reason to think they won't take care of business. Just get pressure on Manning early and often, and keep scoring to raise the pressure on the team overall until they crack.