Here's one: having no idea how your hair will turn out once it's dry. I can do the exact same thing on two different days, and once my hair finishes air drying it's reacted completely different from one time to another. I know, I know, there are a myriad of reasons for this, but I think this is a problem curlies all deal with at some point.
2c/3a, dense, fairly coarse, normal porosity and elasticity, bsl curly, WL wet
Low poo: Giovanni 50 50
Co-wash: down under naturals, tresume naturals
RO: AOHR
LI: Giovanni Direct, Desert Essence curl cream
Stylers: kccc, HE smu, brhg
Oils: coconut, argan or evoo