Well done Fin, you survived your first day!
I do find it much easier to start eating later in the day, its as though my tummy doesn’t wake up until I give it that first meal. But you will find what works for you over the next few days.
It sounds like you might benefit from finding something productive to do for a couple of hours in the evening; maybe being here and reading all the forums or perhaps some knitting or something equally daring?
All the best for tomorrow. Which shakes are you using?