The dough needs to rest overnight in the refrigerator, so plan accordingly. It’s important for the Danish dough to come to room temperature before you roll it out, or the butter will not incorporate correctly.
This dough can be frozen, but doesn’t rise quite as nicely as when it’s fresh. If the dough is not used right away after being out and turned, it will puff up in the refrigerator. This will make it a little harder to roll out, but you will still have good results.
The copper molds used are very hot when they come out of the oven, which can make it a little tricky to get them out. Use a kitchen towel and wrap it around the base of the copper mold, then run a knife carefully around each roll, and flip them onto a wire rack.
Make sure to line the bottom of each mold with parchment paper as noted in the instructions, or the buns will stick to the bottom and it will be extra hard to get them out.