If you aren't a homeowner the facilities are the hard part. Need a large space where you can have a glass furnace and concrete floors that won't get damaged by molten glass. Lampworking is easier to get started in, but still need a place to run a torch (ideally with a vent hood) and store oxygen/propane cylinders.

As a hobbyist? Not hard at all! If you're in a medium/large city, there's almost certainly one or two glassblowing studios around that have classes. As a career? That's a whole lot harder.

You should visit the coast of Maine this summer and find out: https://www.haystack-mtn.org/

The late Ezra Zygmuntowicz was a glassblower by training and trade long before starting Engineyard.

Definitely go to a glassblowing camp if you are interested. If you have prior experience trying to control a fluid medium, like pottery for example, then that may help. In order to set up your own shop you'll want to be somewhere with low fuel costs.