One of the most difficult things for parents to cope with as part of a child custody agreement is having time without the kids when they are with the other parent. Instead of looking at this in a negative manner, you can use this time to improve yourself. Feeling better about yourself and the direction of your life can vastly improve your parenting relationship.
During your marriage, you might have focused on things you could do with your spouse. Now that you aren't married, you can think about things that you wanted to try then but couldn't. Embrace your new-found freedom. Take the days that the kids are with your ex as a time for you to be adventurous. When it is time for the children to be back with you, find things you can do with them.
Another thing you can do during your alone time is to evaluate what changes you want to make for yourself. Start with naming the qualities you appreciate about yourself. Build upon these to get yourself to where you want to be.
You should also take this time to work on forgiving your ex and letting go of any regrets you have. This can take some negativity out of your life and might help you feel more in control. Remember, when you hold on to animosity, the other person isn't suffering, you are.
While you will have to be serious to handle many adult duties now, you can still have a light attitude about your life. Make sure that you are actually enjoying your life. Your children can thrive better in a positive environment. Work with them to make this happen if everyone is upset about a contentious divorce.