Murky/uncharted waters phrase
A situation that is unfamiliar to someone and potentially dangerous or difficult.
As I walked inside that abandoned house, I realized that I was getting into completely murky waters.
When I first visited Vietnam, I was in uncharted waters crossing busy streets.
When he first started working as a Youtuber, he entered murky waters of copyright law.
The origin of this phrase is not clear.
Stupid or crazy
He is definitely not the full shilling when wearing a thick coat in this sultry weather.