The most important thing I learned from this class was definitely that even the old materials need to be removed with care, as they become the template for the new fabrics. You also want to be careful to remember the order in which everything is layered (and trust me, there are a lot of layers).
Before the next class I need to get on with sanding the chair, fixing the broken arm and finding the perfect fabric to recover it in. Luckily I already have the next project lined up. But I'll share that one in due time.