Farm rats under the bridge for humanity. Or if you already have the key to the lower city you can try your luck against Capra demon and try to get to the sewer to farm the rats there. Next, make sure you have saved Lautrec from the chapel prison cell (he is on the upper floor in a little area that is slightly before the steps leading up to the Gargoyles) and have then talked to him again at Firelink Shrine. While at Firelink you should revive to human. Also make sure you have upgraded your flasks via the fire keeper if you haven't already. Then hop on the lift, take care of the few baddies on the way back up, and summon both Lautrec and Solaire. Only way you can lose now is to go full retard.
But that is just if you are frustrated and want to do it the cheap way.