You can sort out the itinerary with your local CX office, ask them to make the reservations and tell them you are going to pay and ticket in XXX city. They will give you a reloc number. Just quote that number to the nice staff at your chosen CX office and, if your itinerary is correct by the rules, you'll be on your way in an hour or so. Just be the first in the office in the morning and you'll be OK. To be safe, allocate the full day in case of problems (ie a problem in interpreting the rules).