Speaking from experience, I would caution you about hacking off the top edge of your pot. If you remove the rolled edge of the pot, you may accomplish your original goal, but you'll definitely accomplish the following two. First, by removing the rolled edge you will have effectively removed the safe 'no sharp edge exposed to cut you' rim. If you do so, be sure to sand smooth the ENTIRE rim. If you miss a spot, your lips will let you know it. Secondly, you will have removed a good bit of the pots structural integrity. That rolled rim actually helps to retain the pot's shape. Doing away with it will have negative effects on the pot. I would also like to point out that (depending on your pot) your pot's lid may no longer fit correctly after the modification.
Now, with all that in mind, if you still want to cut your pot, let's go get the Dremel!