Hi,
Guys, I have an it/that question.
A: What can I do to meet her?
B: You'd have to throw money at her to meet her.
C: It's hard to do so/that/it even if you do that/it.
I thought of a situation where three persons are having this conversion, and I can't seem to determine which one of those words in blue I should use.
I wouldn't say any of these choices is definitely wrong. There are certainly style considerations, and concerns about repetition of words.
I prefer It's hard to do that even if you do (it).
Best wishes, Clive