I failed to tighten my new SPD cleats (never actually touched any before) tightly enough, so the loosened during the ride until finally I managed to not unclip and drop my new bike on its right side and snap the rear derailer. Then I managed to let the cable unwind when I was changing it, and the unwound cable managed to get stuck in the cable housing. Then I managed to not figure out how to disassemble the bar-end shifter assembly, to change the cable housing. At that point I was slightly depressed.
Fortunately, today when I walked my bike to the local bike shop, the bike shop person figured it out and fixed it for me in a couple of minutes and only charged me 6 €. For the record, the Shimano bar-end shifter is opened with a sufficiently large Allen key clockwise.
I'll need to install one of those twisty steel tubing things mountain bikers use to shield their rear derailers. It'll make my already wide-looking 406-wheeled rear look even wider, but I guess it won't be an actual problem before the bike can't be tipped 45 degrees without parts touching the ground.
My local bike shop and others are found on my list of bike shops in the greater Helsinki area. If you are a local, please feel free to contribute.
Oh, and new bike photos.