I found that when you find you cannot beat an enemy under any circumstances, you're probably in the wrong place. If you went to the skeleton graveyard first when landing at Firelink, you know what I mean (instant and brutal death). There are two ways into Blighttown. One is much harder to get to than the other (hint hint).
A second note: Blighttown almost made me cry. Until you get your learn it really well it is extremely frustrating. When I got to the bottom the first time, I truly though the game was impossible. Many hours of effort later and now I can run around there like a god.
Yep, that's what makes this game great! What seemed impossible at first (Sen's Fortress, Boss Fights, etc.) because "easier" once you know the tricks.