Big huge thanks to our very own Kyle Throw for constructing this super detailed list of all the tunes I've done and the relative difficulty of each!
Difficulty is ultimately subjective and impossible to objectively quantify so keep that in mind while you peruse through the list. Having said that, Kyle implemented a rating system based on the amount of techniques needed to perform a given piece, and assigned different difficulty values to each technique, also factoring in to what extent the technique in question was employed.
All in all, I think its pretty damn accurate even though I would personally swap a few things around a bit. But thats kinda the point ... everybody is different and has their own set of strengths and weaknesses.
Enjoy, guys! This could be a great way to assist you in choosing your next piece to learn. Both in terms of overall difficulty and if there are certain techniques you need to work on.
Thanks again, Kyle! You absolutely rule for doing this.