You will do just fine, don't worry. My W moved out into an apartment more than 5 months ago and I was depressed thinking it was going to be horrible as well. Well it wasn't that bad afterall.
The separation reduced the tension that was hanging in the air when we were both living together under one roof. I instantly got more than twice as much closet space in the house. I quickly adapted to being a single Dad. I get to see my kids every day of the week and every other weekend. I have learned to appreciate the "me" days that I have when my kids are with their Mom. Their Mom and I are very effective co-parents and get along better now than when we were both in the house together.
So chin up - it's not as bad as you think it will be.