Step 1: Supplies
Step 2: Put it together
Step 3: Measuring up.
If you have a new puppy, just jingle the bells every time you take them out. Before long you will hear the soft jingle when they ring for you on their own. Nothing is more satisfying than not cleaning up a mess. You'll be happier and so will they.
You can just make out where my dog had begun scratching to get out. Thankfully no more of that.