Sounds good. Yes, but discovery is expensive. In my typical case (not family law), the suit costs about 1 million per side and discovery is probably 50% of that. Lots of motions as well.
Make sure the attorney is grounded and realistic with your goals and a budget. Make sure it is someone that won't encourage you to fight every battle, and instead focus your time, energy, and money on the ones that matter.
I think you need to make the decision to tell him off once and for all (hey bud, everything is going through the lawyers, don't talk to me about this again), or simply ignore every, single thing he does.
If you answer sometimes, it will just keep it raging.
Yes, we all remember the early BD days when they are excited about the "freedom" and having things in the open. And then, as Job reminds us again and again, six months later reality sets in. That is going to be MAJOR for your wallower.
I wouldn't agree to his separation date. There must be a reason, even if it is his psychological justification for his actions. Make sure to discuss it with your attorney, but I think the HaWho I read about was working on this marriage up until last week and rightfully claim she thought they were in a reconciliation period.