I don't give monkey´s
Not my cup of tea
Let’s have a butcher’s.
Bite the bullet.
Your guess is as good as mine
To do something unpleasant or painful because it is necessary even though you would like to avoid it.
Have a look at something
Something that someone likes or is good at usually used in negative statements
To not care at all about something
When you don't know the answer to a question.