I am so sorry to hear you have to go through this. It is a process that you will be able to work through. You will be able to teach your children how to handle difficulties by the way you handle it. It is okay to let them see you cry once in a while. They will need to know that somethings are painful and it's okay to cry.
One of our house sales was the house we bought from my mom, that I had grown up in. None of my siblings were in a position to buy it so I felt like I was selling the family home. We took lots of pictures so that we could go back and reminisce about special parts of the house. I just kept focusing on the blessings of the move. Every move has blessings. One of yours will be to get in a better financial situation so that you will not be a burden to your children later. It doesn't make the pain go away but it helps you manage the pain.
Last summer we lost our home as my husband was unemployed for 15 months. We cut back on everything we could so that we could continue to make payments but by the 12th month, we had to finally face the inevitable. Yes, it was humiliating but the more openly we talked about it, the more people were able to be a comfort and support for us.
Now, I see my kids handle adversity and change with a mature attitude. They know that on the other side are plenty of blessings. They have learned how to make new friends while staying in touch with the best of teh old ones. We also talked about the sadness with moving instead of bottling it up. Then we learned how to help each other in the ways that were most helpful. Everyone goes through change and difficulties differently. For example, my kids know when I just need a hug.
Be sure to turn TO your husband throughout this instead of turning ON each other. Let him know EXACTLY what you need during the stressful times. For example, tell him that you need him to tell you that he loves you when you just need that kind of assurance. Men are fix-it kind of guys so if you just need to vent about the experience, find a girlfriend. If you must vent to him, be sure to tell him that you just need him to listen and say that he agrees that it is hard.
You will do fine, but like every ending there will be a process to work through. Wishing you all the best.