The best way to pick an avocado that’s ripe and ready to be used is to check how it behaves when you add a bit of pressure on its surface.  Ideally, the avocado should be slightly soft to touch, but still firm enough to hold its shape. If the avocado feels mushy, it means it is overripe, and while you can still use it for this recipe, it won’t stay fresh for too long, and you won’t be able to store it for later.