Jamie, its super easy, after sanding to get the edge
nice and straight you pass the torch across it just
so that it clears up(its slightly melting it) plus
it puts a minor radius on both edges... just looks
alot nicer and gives it a finished look. Test on a
piece of scrap to see how much time you need to spend
on it
EDIT
If you hold the torch square to the edge it will
radius both sides at once