Okay, here we go.
First off - it will all get better in the end. Keep that in mind at all times.
I have a personal mantra that helps in times like this: “Remember that NOTHING you are going through is unique, other people have dealt with the very same thing before. Some have done poorly, some have done well. Your job is to figure out what the people who succeeded did to succeed, and you will too.”
So coming here and asking is a good start.
If you can afford an attorney by all means do so. It will be incredibly painful (financially), but you have to consider the long term. I worked with an attorney who called his plan ‘the secret attorney’ where I did all the face work & negotiation (under his guidance) and he drew up papers that withstood a serious legal assault a year later (whole 'nother story - won’t tell right now.)
As for your kids - many children are the products of divorced, hybrid families. They won’t feel a stigma from that like they may have 20, 30 or 40 years ago. You must keep up all the good communications with them and don’t be afraid to speak to them in adult terms, children have the wonderful ability to understand large concepts better than you might believe.
Remind them it’s not their fault, that you love them and you will always be there for them. Keep repeating that. They listen.
Regarding yourself, just remember that even if the situation may seem ‘amicable’ (and I don’t know your situation), protect yourself. Seek guidance and counseling. Things may seem like they are low key but your soon to be ex-spouse may be working to ambush you. I know this from experience.
You will have a life when it is all over, and it will be surprisingly refreshed and fulfilling. You will have new loves, adventures and experiences.
Always remember - you are not alone! Others have gone through exactly what you are going through (it’s a big world out there) and they have THRIVED!
Be one of them!
Good luck and please return with updates. I would be glad to expand my input on any topic. Personally, I’ve been through a lot and I would not mind helping at all.