If you think the problems you are tackling every day are hard, it might be because you're innovating. You're out front. You are at the head of the peleton.
In Bike racing, the peleton is a group of riders drafting off of each other to save energy. The riders at the very front bear the brunt of the headwind as the group collectively powers forward.
For entrepreneurs, the temptation to be the leader in every element of your business is natural. But avoid that temptation. Pick the races where you absolutely must lead the peleton the whole way. For the rest of them, sit back, strategize your attack, and save your energy. You'll need it later.