The best way to avoid overwatering is to make sure your soil is completely dried out before watering again. Most succulents can easily go three days (and sometimes even a week or more) without water–so when it doubt, wait before watering.
Having a record of when you've watered your succulents is a simple way to prevent over or under watering. We highly recommend using the Succulent Tracker app to make this process simple, easy and fun.