Taught myself like most skills I have. Took me about five years to learn to be confident and comfortable with what I was picking, but once you have it down for certain types it becomes much easier. Really you just need to know what are the deadly poisonous ones, the look alike, and which ones are easy to know. I probably know about 2 dozen eatable types around my area and the handful of poisonous ones too. The pysop is just retards eating things they don’t feel confident about.