Hi, I just did this job using this helpful guide - thanks to the OP. A couple of points that might help: The clips in the trip piece come out/go in vertically - i.e. they have to be pulled straight downwards. You can't see this until you get the first couple undone. The other thing - I would not suggest using a 22mm spanner for this job, as most 22mm spanners are going to be so long that it will be awkward to get the business end on the nut and work it in the confined space above the headlining. Also if you use a foot-long spanner to tighten the nut it would probably be quite easy to overdo it. I'd suggest a stubby adjustable, or even a socket on a stubby ratchet. Hope this helps...
P.S. I did the job on the GF's Fabia 1 vrs, not my Fabia 2.