Be careful if you do your own edges! I one sliced through the skin and muscles/tendons on my right hand after getting over zealous with a file one evening at race training. The result was a general anaesthetic, a LOT of stitches and quite a few weeks of physio after!
Saying that just wear a glove and you'll be reet.
Waxing is dead easy though. Melt on to ski with iron, smooth over with iron, scrape off, then brush! 10 minute jobs for such a noticeable difference!