work oneself up to something

tv. to get oneself mentally ready to do something. I spent all morning working myself up to taking the driver’s test.

See also:

a whole different animal
a whole different ball of wax
a whole different beast
(something) to go on
a walking
a walking (something)
a/the feel of (something)
(I) wouldn't (do something) if I were you
a straw will show which way the wind blows
a casualty of (something)

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