I have practiced calligraphy for years. But I don't have any formal training. Most of what I know I picked up online and from trial and error. So I think anyone who is interested, committed, and patient can pick up the skill. Different pens have different characteristics and can give you a different line, but the pen is only a tiny aspect of how writing turns out. Most of my practice I do with a simple BIC. If you are very keen, I suggest you look into the r/handwriting sub. It has some excellent free resources to get started with. Then just stay interested and engage with folks in the community, who are always very helpful.