You can't fast travel at the bonfire you find without the Lordvessel, so you have to backtrack all the way back to the tree and climb up and up and up back to the lake below blighttown.
I'm pretty sure that's what i did on my first run and i remember saying to my friend late in the game that it would be nice to have fast travel like ds3 wich i played before. And my friend telling me i was then minutes away from unlocking fast travel. Honestly it was fun and i don't think it was that bad.
how the hell do you get back up the tree? I thought if you didn't homeward bone after the dragon lake and you rested at a bonfire, that's it, soft locked, gg.