@knittingsquirrel Some lichens are big and very easy to ID. Some are difficult. Easy to start, difficult to “finish”.
So, go ahead and start! “Ways of Enlichenment” is a good (English language) site. Other sites are good for learning how lichens “operate”. A good, local identification book is indispensable. Make it casual and fun and you’ll learn a lot. Lichens are weird, wonderful, overlooked organisms. It’s hard to get bored (but then I’m a total nerd.)