I googled way over my head and found this:
way over my head - definition of way over my head
Interested in Language
Much grateful if you could tell me what the following sentence means:
"I was in way over my head."
(1) "Don't ask me to explain English grammar. That is way over
my head." = It is too difficult for me to understand.
(2) "Tom is the manager of a big company, but he is in way over
his head." = He doesn't know how to run a company. The only reason
that he is manager is that his father owns the company.
(3) Here in the United States, we also have this saying:
Our new manager is young, beautiful, and speaks in a very
beautiful manner. But she doesn't have a clue. She does not know
what she is doing. The only reason that she is manager is that her
boyfriend owns the company.