Do it bit by bit
When organizing, commit to a single area or pile that you can complete within the time available. When you finish that assignment, you can stop for the day. Of course, if you are motivated to continue, fine. But don't feel guilty if yo wrap up, you only committed yourself to that job. When you're ready, select another area and tackle it. Gradually you'll work your way through the entire house. Remember, any big project is only the sun of several small projects.
After you've been working for a while, your space may look like a train wreck. Don't worry you haven't derailed. When you're organizing a cluttered space, it always looks worse before it gets better.