This is never easy, I know my girls benefitted quite a bit talking to a counselor about the divorce. They were 7 and 3 at the time. I read a few books about children and divorce, and I joined a support group at the church I was going to at the time.
Remember, they will go through the stages of grief also , just like you will. Don't be surprised if one day they are fine, the next they are mad at you, the next their dad. It's normal.
My youngest seemed to endure the divorce pretty well, until my first time trying to date. She told the guy, " Get out of our house, you're not my dad!"
I thought I would die! She's 17 now, she thinks that's a funny story.
Hang in there