Mealies are awful!Sorry you had to go through that. Years ago I had an outbreak of mealies, lost a plant because of it, now I know what to look for.
And yes, this is definitely one big learning experience, plants make things look so easy and of course an untrained eye lets all sorts of disasterous things happen. We learn as we go, I definitely know more now than I did a few months ago!
It was OK, wasn't something too serious. I really hope all turns out well for you, I hope you don't lose much of your collection!