Things went quite wrong this time.
First, I was told everything could be picked up in Bremen or Kiel. So I headed to Kiel, then found out that shipping to Kiel would cost €200. While waiting for the delivery at the port in Kiel, I called to ask when it would arrive (so I wouldn't be stuck in port for 10 days and have to pay another €300).
I was told everything was available at the branch in Kiel (including the 3.3m long track), so I walked there for an hour to find out, with the help of some really friendly staff, that the information I'd received over the phone was completely wrong. The branch manager also did a great job and even helped me with the arrangements so I wouldn't have to walk there and back for another hour.
Anyway, the parts were supposed to arrive soon, so I decided to stay put and trusted that everything would be there in 1-2 days (after the holiday), since it was supposedly ready for shipment. In the end... It took another 10 days or so for the last two parts to finally arrive.
All the back and forth, the incorrect information, and the poor communication were really unpleasant.
In the end, I even received an invoice even though the parts had already been paid for at the store.
The small discount on shipping costs and the consistently friendly staff helped keep me from being completely fed up. But the processes definitely need to be improved.