Your first couple of batches are for figuring out your process, so you have exactly the right attitude. I'm sure your beer will come out fine, so I wouldn't even necessarily use the term "mistake" to describe anything you may have done.
Many batches behind me and I still learn something or refine my techniques every time I brew.
You can't be a real country unless you have a beer and an airline. It helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer. -Frank Zappa