Hardest lesson to learn in archery is …

Quick question for all you archers out there. 

What is the thing you struggle with the most when it comes to archery? This could be a physical aspect like, your release, stance, draw  cycle or a mental thing like judging distance or mindset before a shot? Maybe its the technical thing, like arrow tuning or bow set up?

I’m thinking of writing a few posts on different topics and welcome thoughts and comments from you out there.
Thanks for reading