Don't worry too much. They will still blow you away right out of the box. In fact, I'd suggest not tweaking them at all for a while so you can then get an ear for when you start to tweak them.

Tweaking is addictive and you can create great results with a little work but then the laws of diminishing returns seem to start to apply but you are already addicted and it's too late.

With great power comes Awesome irresponsibility.