Since you’ve already gotten great advice about choosing and dealing with a lawyer, I’ll say this:
Throughout negotiations, until you get official notice that your divorce has been finalized and your settlement can no longer be altered, always remember that your soon-to-be ex-husband is now your legal adversary. Your first concern in all negotiations should be to protect yourself and the kids, even if that doesn’t feel so good sometimes. Don’t trust him to be fair, to put the kids first, to treat you with respect, or to act rationally. He may do those things. Or he may not. No matter how well you think you know him, or how in love with him part of you might still be, getting divorced makes people act in ways that might not be predictable, might not make sense, and can be very, very destructive. Get everything in writing, and make sure the terms are crystal clear.
Mediation could save you a ton of money and effort. If you’re a hard-headed, smart negotiator who sharpens up under pressure, and if both you and your husband are committed to getting the divorce over with, mediation is worth at least checking out.
If either of those things isn’t true, though, you could get really screwed in mediation. A mediator’s job is to get both parties to agree to a settlement, whether or not that settlement is actually fair or in either party’s best interests. Don’t count on a mediator to advocate for you, even if he’s being incredibly unreasonable. If you’re not a particularly shrewd or assertive negotiator (and be honest with yourself about that), or get rattled under pressure (be honest about that, too), then mediation is not for you.
Mediation’s also not for you if your husband drags his feet on getting the divorce finished. He can legally ignore a mediator’s phone calls. He can’t ignore being served with papers.
If there has been any history of intimidation or abuse, then mediation is really not for you. In times of stress (like, say, getting divorced), people almost always stick with the patterns they’ve learned, even if they know those patterns aren’t helpful. People who’ve been steamrolled in their marriages almost always get much less in mediation than they could have in litigation.
Even if you decide to go with mediation, you should definitely have a lawyer tell you what you’re entitled to and could reasonably ask for. It might be more than you think, and there’s no reason for you to accept less.
My ex and I used a single lawyer (my lawyer, really) to file papers. But we had no kids, separate bank accounts, and almost no joint property. (We shared a used car. He bought out my interest in the car for $3k. I could have asked for more, and probably gotten it, but the lawyers’ fees would have made that pointless.) He dragged his feet about getting the divorce over with, forcing me to go the lawyer route.
Things will end up OK. Stay strong, stand your ground, and have a good source of emotional support. It’s going to be a long year or so, but you’ll be so much better off afterwards. Hell, you’re already better off right now!
Good luck, and keep us posted.