Those videos are pretty good.....but, I would recommend skipping the whole detuning thing.
I know some people are manic about detuning, but really, that's a hold over from the straight ski days. The current skis are designed to use the entire edge, and by doing an automatic detune, you're effectively shortening your usable edge.
When doing your first self tune, try them without detuning first. If you remove all the burrs religiously, they should be fine. If you're a skidder or spend tons of time in the bumps, and find your tips and tails are hanging up regularly, then try a minimal detune. In general, though, with the new skis, detuning should only be used if you've purchased a too-long ski.....the detune will effectively make the ski feel shorter.
As alway, JMHO and YMMV!!