You need Swordsage 2 for Assassin's Stance. Your first stance has to be a first level one.
JaronK
Would taking the Swordsage level at level 9 and using a feat to get the stance work?
Rogue9/Swordsage 1 with Assassins stance, and Precise Strike.
What the heck is Precise Strike? Do you mean the homebrew feat on DnDwiki, because that's the only thing I can find?
Its a feat from Dragon 310, where you forgo sneak attack dice to get a +2 bonus to hit. Which most people then PA into 4 points of damage.