I finished The Colour of Magic a week ago, and decided to let it stew for a while before posting about it. I knew I wouldn't review the book: it's older than me, and I'm rather certain there are already more reviews than I can count out there.
Reading Pratchett was a release, though.
As a fantasy writer you hear a lot about suspension of disbelief. Despite the magic and the supernatural, you have to make your reader believe that your story is real, that the characters exist. Closing the book must be like waking up: you're slightly dazed, and when you look at the clock you can't believe you slept that long.
Often as I work fantasy elements in my story, I wonder if it'll work. Am I pushing too far? Will the reader scoff and stop believing? Will he think I'm abusing his trust?
The Discworld is a reminder that you can get away with a lot more than you think. It takes talent. It takes justifications. But it's possible. If Pratchett can get away with a world riding on top of four giant elephants standing upon a giant turtle well... somehow I feel my modest bit of magic can be worked in, too.
Don't be afraid to let your imaginations run. That's what fantasy is for.