I changed the left headlight bulb (low beam) following the steps in the first post back in February 2013. Had a tough time disconnecting the wiring harness connector at that time and somehow pulled it out but it took 20 min or so -simply because I did not know what I was doing - I was wrestling with it. Now, 2 weeks ago, right headlight low beam bulb went kaput. So I searched online for some easy way to disconnect the wiring connector and found this:
It's for Audi, but the Octavia 2 also has a very similar connector and using this method (open the side latch by turning a screw driver), I could disconnect the connector in a few seconds. Though of sharing it here in case it's useful. Regards, Anand