I am mostly self taught with lapidary, metalsmithing and glass making skills. Lapidary was first (many years ago), then metalsmithing for about 7 years and in 2015 I bought another torch, a couple books, some glass rods and started teaching myself glass making.
Making things with glass is a steeper learning curve than metal and there are so many ways to go with it. Beads, fish, turtles etc. and the color palette is so extensive.
Not to mention mixing metals with the glass and the effect that has when the metal reacts with the glass.
Between lapidary, metalsmithing and glass, I'll never run out of new things to try. It is a good thing I purposely purchased a small kiln. That way I can only be working on things until the kiln is full. I can get lost in time working with the glass.