I skimmed the thread so I apologize if I am being redundant. Here are a few things that I have found helpful:
1) after every meeting, I write a confirming email and ask for people's input if I got something wrong. I include who is supposed to do what by what date. If something important didn't get assigned to someone with a deadline, I ask for this as part of the followup.
2) figure out what is crucial and come up with an exit strategy if that crucial thing doesn't happen, i.e. change schools, home school,etc. I find that knowing my options if the worst happens helps me not feel trapped in the situation. With my 2e kid this has helped me a lot.
3) I have had to work on letting go of past wrongs. Ok, maybe the 1st gade teacher did something crappy but we are in X grade now. What do we need to move forward from where we are right now.