I learned a lot, mainly not to experiment with new-to-me techniques, like quilt-as-you-go, on someone else's quilt. It's not that the quilt didn't turn out, but trying new techniques slowed me down and cost more money. For instance, I ended up adding another layer of batting to disguise the lumpiness of the seams. I had to quilt more to secure this extra layer of batting which kind of defeated the purpose of quilt-as-you-go and added a ton more time. I had any number of other trials during construction that I'll certainly learn from.
Gone are any delusions that I could or should quilt for someone else. I disliked the whole process. Quilting as a business...pshaw!