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general::
Phrase(s): let oneself in for something
to make oneself vulnerable to some difficulty. • I don’t want to let myself in for a lot of extra work. • You really let yourself in for some problems!, Phrase(s): let someone in for something
to cause someone to be involved in something, usually something unpleasant. • Fred had no idea what his brother had let him in for when he agreed to take his place in the race. • Jack didn’t know what he was letting himself in for when he married that dreadful woman.
McGrawhill's American Idioms And Phrasal Verbs