He got a seeing-eye dog. He learned to match his socks for color by the location of safety pins on each one. He found that humans, like bats, have sonar capability, which allowed him to detect sound vibrations bouncing off objects like open doors, so that he could avoid running into them. It took many years, but Weihenmayer managed to come to terms with the loss of his vision. He is at peace with that.
Attitude is absolutely central to healthy adaptation to blindness.
If your attitude is that, 'I'm not going to let this get in the way,' then you're going to lick blindness. When hiking, Weihenmayer uses two Leki poles to scan the terrain ahead, or below when descending. On rock, he feels ahead for holds. On ice walls, he judges where to swing his ice tools by tapping lightly against the face and listening for the pitch that he knows indicates healthy ice. I just perfected it to the point where you can do hard things.