Cali and HaWho gave you great advice Irish. I will add this: know what YOU want. That's sometimes really hard to figure out, but once you know what YOU want, everything else will fall into place. That was the first bit of advice from our mediator. It has proven to be quite sound.
There, just saved ya $350 and hour wink take the girls out on me wink
Seriously though, good luck. Stay strong. This is a business meeting, no more, no less.
There will be time and place for the relationship / emotional piece. Not here. You and your daughters have been through enough. xoxoxo

M 20+ T25+
S ~15.5 (BD)
BD 4/6/15
D 12/23/16

"Someone I loved once gave me
A box full of darkness.
It took me years to understand,
That this too, was a gift."
~ Mary Oliver