Start with cutting the bacon into thirds. If you leave the strips any longer they will never crisp up. There may be a few pieces of bacon left over.
You can make this ahead and bake when you are ready!
Letting them marinate with the brown sugar for 1-2 hours makes all the difference in flavor.
As for the pan you use, this makes a big difference. I asked my mom how she did it and she said she uses a glass baking dish, not a foil-lined baking sheet. To clean up after, she fills the pan with hot tap water and lets it sit for a few minutes. The caramelized sugar dissolves away.