I'm also self taught & have been tying for about 47 years. I can very much agree that a good tying class is well worth the time & money if it's something you have to pay for.
I consider myself a fairly good tier, but it's taken me a lot of trial & error & a lifetime of learning, not that I'm not still learning, but a class would have certainly shortened the learning curve! I've not taken any classes, but have been fortunate enough to have had the acquaintance of many superb tiers over the years, from which I've gotten advise & tips.
cgrphoto, great post & great advise for anyone who wishes to improve their tying or are just beginning!