Mine is that I can't tie dry flies well enough to fish.
Get some videos. Heck, It took me a long time with these big hands to tie any fly worth fishing. Stick to one pattern like an adams until you are happy. Proportions are very important (Jack Dennis has a good tape). Tying clubs, friends who tie, enter swaps. I have a few flys from swaps whose maker was less than perfect yet over time they improved greatly. Tony Spezio used to send me partially tied flys and I learned a lot from him. Go to tying shows and ask questions of the tyers. Don't ask for freebies, just advice. The Flytyers Benchside Reference is a book you might want. It focusses on steps rather than a whole fly. Keep tying those caddis and get those skills down pat. How you use your thread, amount of hair and such are important lessons. My flys? Sometimes bad or good. Learn the steps and you'll do fine. We have some good/great tyers here and each could tell you they had a time of it at first. #1 is to tie as much as you can. Practice and ask questions when you have a problem.
Murf
