In my experience there is already such a wealth of professional and hobby products out there that it’s impossible to break into the market. Find something you like and just do it as a hobby if you can recoup any of the cost selling what you make that’s great but it shouldn’t be the main focus. The worst thing that can happen to a hobby is it becoming a job.

I was about 13 at the time and on a family vacation. My parents were in a store shopping and I was bored so I went to stand outside. I’m standing out there and this very old, very fat, very short man (he looked a lot like Danny devito) walks up to me and says “Aren’t you just the cutest.” He then pinches my cheek and walks away. I’ll never forget him.