Am just starting out on this journey too. Have decided to protect friends and family in the same way as the children.
Not much advice, I'm afraid. I think it's hard especially when the children are hurting too. We've agreed a neutral mutual decision approach which I think is good but realise that I've left myself short of outlets for how I really feel (as all our friends are really joint friends).
My approach is to try to focus on my long term objectives. For the sake of the children, I believe it is important for both their parents to have a good working relationship, possibly even friendship. I want the children to have a good relationship with both of us and not to feel that they have to take sides.
I'm lucky in that I feel I have done everything humanly possible to save the relationship so I don't have any unresolved issues regarding that aspect of us separating but, of course, I am still hurting. I know from personal experience (my parents separated when I was young) that whatever I am feeling the chances are the children are feeling worse.
On a practical level, I am trying to look after myself well, get enough sleep, eat well, get organised around the house, etc, as I know that I need to be in the best possible state to support the children. I'm also trying to ensure that I get some time off so that I get a chance to recharge my batteries, go out with friends, have a few drinks etc.
But I have good days and bad days too. So I'm trying to be honest with myself and the children. If I'm having a bad day I will tell them and will try to do something to change the dynamic (when I remember!). Get out for some fresh air, dance round the living room, sit in the garden for five minutes with a cup of tea. And when I fall over I try not to give myself a hard time as it doesn't help anyone.