If you do decide to do it, it is straightforward- took me 10 minutes. It does help if you have or can make a simple hollow drift O/D 28mm, I/D 15mm approx 35mm long rather than spend money on the toolset. There is a good sequence diagram on the dt swiss website. Basically you remove the freehub as described in the video you have seen, turn the wheel so that the freehub side is facing up, support the non drive side over open vice jaws or something that will allow the axle to drop out, and carefully tap the axle with a soft headed mallet. This pushes the NDS bearing out and you can then change the axle and carefully drift the new one with bearing attached back in
http://www.dtswiss.com/getdoc/1219c0b7-776d-46ea-8625-dedf5ec2de19/Manual.aspx
Edit: you do need to be careful when tapping the NDS bearing in to support the D/S bearing to prevent it from becoming unseated