I think everyone's experience is different depending on circumstances, but from my own reasonably amicable situation:
Good legal advice - explain as clearly as you can, and don't be afraid to challenge or ask questions. Be very clear on costs.
Just because they tell you you can get X/Y/Z doesn't mean you have to spend time and money pursuing it. Be realistic about your expectations. I.e. there is no point trying to 'take the house' if you'll never get a mortgage to support it.
Don'y make rash decisions, and if something upsets or angers you, cool off before making any decisions.
You don't have to agree to anything, and your husband will need a reason to divorce you, which is your right to contest.
Don't leave the house. Once you're out it will be VERY hard to get back in.
Don't get too bogged down in details - once all this is over you won't care who got the sofa.
Document any agreements in writing between the two of you. If necessary get a consent order; this made my life A LOT simpler later down the line.
Remember on the bad days that this will get better, just keep on keeping on. Get some decent real life support, ideally somebody who can help you be objective like a trusted colleague rather than your best mate who will be understandably biased towards you.
Good luck x