I don't know of a simple tool for making the conversion. There is a really good tool built into b2evolution for importing from Movable Type. I've managed to import from Blogger using that tool. I just had to format the blogger template so that it outputs the blog in a way that looks just like the MT export format. You could probably do the same for Drupal. It wouldn't be very easy, but if you have a ton of posts, it would be easier than copy+paste. I can show you an example MT export file if it would help.

Some instructions and examples would be wonderful!

Here's the export file that MT generated and I imported to b2evo. I don't know anything about Drupal, but if you can make a template that looks like that then you'll be on your way.