Keep in mind that power tools only make the job go faster, not necessarily better. They can also make you screw up things faster. You don't have to run out and buy a lot of equipment in order to do the job, as gregintenn points out.
The Dremel is a great tool, but it hits a very small area and it's not the easiest way to even out a long edge. Belt sanders are much faster and much better for that, but they don't do well on tight turns. If you don't want to spend the money on a belt sander right now, then try a sanding block first and then use the Dremel for finishing.