The best way to learn how to make anything more usable is to watch people try to use it. Most of us have no experience at using adaptive technology, let alone watching other people use it. Locate one or two blind Web users and spending a few hours with them observing how they actually use their screen reader software.
Don’t make me think
Being an expert in online usability Krug gathered his experience in a wonderful book. This summary of key thoughts will help you to remember most important principles and laws.