[sprio]

Never did watches, but did restore/repair antique clocks for a living. Learned by going the apprentice route. No matter which way you go, even as a hobbyist, if you're taking in pieces of value from a customer, make sure you have adequate insurance - just in case! I incorporated and had insurance that covered the value of customer objects in the workshop and/or in transit. Something to consider in today's litigious society.