Last month I took an upholstery class at The Furniture Joint in Manhattan. Starting with wooden frames we built little ottomans. We also learned how to hand tie springs, which is really annoying and hard to do.
Unfortunately I missed the last class, so now it is up to me to finish the job.If you are in the NYC area and interested in learning upholstery I suggest taking this class. You will learn many tricks of the trade and the air compress staple gun is super fun to use.