In short, yes you can make a living as a fly fishing guide. Many people do it successfully all over the world. Of course, like any job, there are ups and downs and it's not always easy. But if you love fly fishing and helping others learn and enjoy the sport, it can be a great way to earn a living.
There are a few things you need to consider before starting out as a fly fishing guide. First, you need to have a good knowledge of the sport and be able to teach beginners. You'll also need to be familiar with the local area where you'll be guiding - knowing the best spots to fish and how to get there safely. Finally, you'll need to have all the necessary equipment and supplies, which can be expensive.
If you're serious about becoming a fly fishing guide, start by doing your research and talking to other guides in your area. They can give you tips on what works well for them and what doesn't. Once you've got everything sorted out, start marketing yourself - let people know that you're available for hire!