What has got me in the past is going by hand and the wood is super hard or just plain too much to remove and I get tired of the file and I want to move on to the next step when I'm really close to getting where I want to be, so impatience kicks in and I fire up the belt sander and well the duck is doomed!
Better as stated more than once to start with the belt sander and then fight the patience issue and go back to hand tools.
Also being a full time sitter, power tools make a hell of a mess with me, belt sander, dremel tools, you should see me after a day on the chainsaw.