Truly the best way to see obvious differences is to look at other peoples photographs. Not only will you see the results of a certain combination of film and developer, but also see the context of why somebody with experience used that combination to fulfill a goal. Try Flickr or the other photo sharing sites, the images are often accompanied by notes.
Originally Posted by Truzi
Processing should be based on knowledge, with sound reasons to do something, and with a sound plan. The alternative of going on a wing and a prayer is that you will never know if you made a mistake, or if it could be better.