I've done all the bosses solo, o&s nearly made me give up but after 2342 times
4kings died more times getting to them than they killed me,
So I started to invade first in blighttown were all the invasions where 2v1 or 3v1, which I expected.
Then I went to the burg and I either over powered them or ended up invading someone casting dark bleed.
Anybody found any good low lev pvp, may just stick to helping people kill o&s a couple of thousand times to even up the score.