If you go to the site for dvdrebuilder and look through their information and read the help files that come with the program, you'll see that it is fairly easy to use in its standard form. You just have to pick which encoder you want to use, where your dvd files are located, and where you want the output. It will do the rest. The installation program they have now comes with most everything you need, though you will have to install avisynth first. There is a link for avisynth there also.
I have to say that I don't see a great deal of difference between the movies I've done with rebuilder and most I've backed up with Shrink. Of course, my tv is pretty small. There doesn't appear to be any difference on my 19" computer screen. I've used Quenc on high quality (SLOW!) and CCE Basic as encoders.