Well, I got the hygrometer and the tubing (ingenious!) and just put the eggs in. I then realized I'd already made my first stupid mistake by adding cold water to the trough. Jeeze Louise. I added a note to the front to only add warm water to remind myself in the future. Sheesh. Hopefully the slow rise of temp will not be a problem since they're only just starting out. Oy. We shall see, huh?
So, am I at day zero now? And the evening of April 16 would be day 18 right? When lockdown occurs? Don't want to get that part wrong!
Thanks to everyone for all the tips so far!