I would recommend taking it at a slow, steady, sustainable pace. It's really satisfying to make huge, sweeping changes, but the things that usually make the biggest difference are the little habits and moments during the day. Incremental progress is the name of the game.

It helps me to pick a point of tension in my life and just spend some time working on that particular thing. For example, I hate when dishes build up, so I spent a whole week just focused on washing them right away. Once that feels like a sustainable routine that I can do somewhat mindlessly, I move on to another little thing.