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.
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.