I've only just learnt how to duck gybe (about a month or so ago) and usually get about 80% of my normal gybes, and 50% of my ducks. If you can plane out of a normal gybe then you can learn to duck gybe no worries -- it's easier than you think! And it's a very worthwhile move to learn, it breaks up the monotony of your typical burn and turn routine.
Peter Hart says about the duck gybe "...the sail is depowered for less time, hence it supplies many learning gybers with their first planing exit". I've noticed that they're about the same in terms of planing out, with a duck you exit switch stance so you don't unsettle the board when stepping.
The main points are:
1) Reach right back down the boom with your back hand before the gybe
2) Throw the rig forward before you turn dead downwind
3) Your old front hand grabs the boom near the clew and immediately throws it HARD back over your shoulder. This is where most of my ducks failed -- the mast should be down and back up in less than a second.
4) Grab the new side of the boom (as far forwards as you can) and go!
When you get it, you'll be planing out and suddenly realise that your feet are all twisted up on the wrong side of the board, it can be fun figuring out how to get them to where they're supposed to be without losing control