This isn't literature, but a TV example of a disabled character that I thought was handled reasonably well, if you're interested: there was a show called Ed about a small town lawyer. Many of the characters were quirky to the point of being ridiculous, but in the later seasons there was a regular character in a wheelchair. There were a couple of episodes about the difficulties he faced, and he was occasionally bitter, but mostly very positive, active, and ended up dating a beautiful and non-disabled woman who told him he was an idiot for thinking they couldn't get past his disability. The character was played by Daryl Mitchell, who was paralysed in an accident as an adult.