mega honking for you...who can you take with you?...just so you're not feeling up against them alone? It really helps if you have someone who knows what you're there for and can encourage, remind and assist you to remember things, help you ask the questions, etc
do that visualisation of them all in their silly pants and silly hats on their heads...that will help you see them as silly and not intimidating hahahahaha!!
Put on your business head and try to leave the emotions at home iykwim...tears later when you breathe again if you can
make a thorough list and bullet points to discuss...who, when, how when it comes to things being delivered, etc
Try not to bring up the negative too much, though it's important to point out where things have not been successful, try not to point any fingers...instead focus on what needs doing and why...and throw it on the table for them to respond to...what, how, when, etc
Be clear about wanting a schedule of what where who and when things will be done, planned, how long will it be for, the minutes of this meeting, everyone involved and their contact details (esp email addys)...you want your clear paper trail on everything. when you email 1 person...email them all so there is no confusion, etc...collectively these people/profs are responsible so keep them all well informed and keep regular contact on progress or where something isn't happening or working, etc
For your DC...get a daily record/diary put in place. This will detail what, who, when things are being done, anything you need to highlight for DC, etc week to week, etc.
You also need to know who the lead Prof/key person coordinating everything is so you know who your 1st point of call is...so you email, phone, whatever, this person as well as keeping the others updated at the same time (CC all involved, everytime you email, need to ask, check, etc....
Hope this is of help to you and I'm sure others will be along with sound advice too
....good luck