I am headed out soon (a few weeks) on a trip that will include waterfalls, beaches, and a volcano. I've read about neutral density filters and got a set for my camera. But I'm sure there's a significant amount of practise required to be good at it. I want some of those lovely arches-of-orange pictures at the volcano and some smooth white waterfalls.
Opinions seem to vary on the whole setting-your-aperture story with some sites saying the camera can do it, and others listing out math involving knowing how many f stops each filter represents. It seems to me the smart thing to do is to practice. But if I had easy access to waterfalls, beaches, and a volcano I wouldn't need to go on this trip! So what scenarios can I use as a substitute to get comfortable with the ND setup?