Can we change the Parenting Plan if its not working out?
Absolutely. No parenting plan should be written in stone because children are always growing and changing, as are their schedules and yours. A judge set the original parenting plan and a judge can change it if needed. This may not be necessary of course. If things are amiable between you and your ex-, all it may take is a verbal agreement to change the plan. However, if this consistently does not work out, you may have no recourse but to go back to court.
There are a few key points to keep in mind when thinking of changing your Parenting Plan. 1) You must maintain equal access 2) Always consider what is best for your child and how he or she will benefit 3) Consider the future as well as the "now" when calendaring out the new plan in order to create a stable environment for as long as possible and 4) if they are old enough to understand, get input from your child or children.
Even if you don’t need to go back to court, it is a good idea to put everything down in writing so everyone has a copy. It also gives the "feel" of a contract. For some reason, people are always more likely to honor something that is down in writing.
http://www.womansdivorce.com/parenting-time-visitation-schedule.html