Keep emotions out of the procedure, and it is a procedure, the best you can.
Listen to your lawyer but keep control of the message, iow, don't let the lawyers get bogged down and drag it out, they cost a lot of money.
Lawyers charge not only by the hour, but many charge min fees for calls and emails. Mine charges .2 for each email unless they have a big response then by the hour, also .25 for every phone cal that is less than that, so four 5 minute calls can cost an hour, same with emails!
Take notes, save questions until you have enough to use up at least .25 or better yet save them for a regular meeting (unless it's an urgent question). Stay organized and keep track of your thoughts ,notes, questions, so you don't waste time and money.
Keep civil and don't let either party use the kid as a weapon. If you see this happening put a stop to it immediately.