Am I underleveled for Tauras Demon?

This is my first fromsoft game , I somehow defeated that awful big thicc demon and got landed in lordrun or something , the next boss, the next boss is tauras demon, i just want to make sure I am not underleveled or something for him, I have black knight greatsword , I upgraded it to +2 idk what that does , I hope I win this fight , I'm scared

Also please give me tips to defeat him if I'm underleveled

/s obviously