I've been tying flies for 35+ years and I certainly dont know every fly tying technique. And neither do you.
So every now and then I take out "The Fly Tyers Benchside Reference" book and learn a new tying technique.
I dont necessarily tie a finished fly but just try to master the technique to the best of my availabily.If it doesnt come out correctly you can always unwind everything and start over or just cut everything off of the hook.
Give a new technique a try. You can do it if you really try!