This is the wrong way to look at it. If a textbook is bad, or is good but too difficult (i.e. bad) you will stop reading it. The alternative to self-studying a

This is the wrong way to look at it. If a textbook is bad, or is good but too difficult (i.e. bad) you will stop reading it. The alternative to self-studying a good textbook isn't studying a bad one, but studying none.