Don't know about soloing, but if you're playing an assassin through TuTu, you will find Dundee's thread here full of useful info. He played an assassin through the whole saga too.
http://www.ironworksforum.com/ubb/no...c;f=1;t=004330
It later continues into SoA and ToB. And we are still waiting for the ending...
DUNDEEEEEEE, if you're reading this I still want to know Rena Ryuuguu's final fate in ToB.