Will it be hard: I don't doubt somedays will be unbearable, others great, and the rest not so bad
Can you do it: Of course. Positive thinking and proaction can do amaing things.
Do you have to do it: No, WA is prochoice. This is YOUR decision, not choice.

Regarding the pre-nup: Did it mention IVF/Assisited Conception processes? If not, i'd argue that the pre-nup be nul-invoid (please someone correct my spelling ASAP).

All the best & stay positive xx