Re: 1992 DT466 Service Manual
You want to be looking for 'ISIS DVD'. You can generally find them for about $30-$40 on ebay motors. Google can probably find you obsolete versions for cheaper. I've no doubt you'll be able to find considerably cheaper versions in less reputable corners of the Internet as well.
It is about as user friendly as a kick in the teeth to figure out how to use at first, but it becomes relatively straightforward afterward. Has the full step-by-step with diagrams, pictures, and all details.