Oh, but I will. Muahahah.
Edit
I could always just throw the sword away and use another weaker weapon.
Or you could just ... NOT use it.

You do need it to get the Knights Honor Achievement, along with all the other "tail" weapons. I played the entire game and never once used it. I played a warrior and had a special bond with my Longsword. The R2 (trigger) stabbing attack is vital to my play-style. Also I highly suggest you level up your weapons and armor, rather than you SL (soul level), if you have not already.
There is just something I don't like about Dark Souls. To me it feels cheap and out dated. Everything from the art style to the combat feels horrible.
I know what it is you don't like: It's very difficult. There's no explanation of anything, and the game is incredibly punishing. It sets you up to make mistakes, and makes you suffer for them.
I thought the exact same thing for the first 20 hours. Eventually, I came to greatly appreciate the art/story/style of the game.
Thing is, it's incredibly easy to find the sword in a completely blind playthrough (i.e. without looking up information on the internet) due to the ever present messages hinting at shooting the Hellkite's tail.
Edit: I suppose you could call playing online with messages present not a blind-playthrough, but that's the way FROM intended the game to be played so I consider it 'blind'.
I'd say there's one way to play the game truly "blind": Offline - no FAQs. I admit to looking up the order of the bosses because the difficulty increase from Bell Gargoyle to Capra Demon was too much for me to fathom. I also looked up how to access the "roof" in Anor Londo to move the middle platform. I'm pretty proud.
