I'm trying to psychologically prepare myself for this cc nightmare by way of accepting the fact that I may have to permanently say goodbye to some of my cc (sniffle), as well as preparing for the nightmare of trying to chase down any updated cc (if and when cc creators start updating their stuff).
I'm currently in the process of trying to purge stuff that I rarely ever use or just don't like anymore... but it seems I need to get way more strict with myself, it's just so hard to part with things when I'm thinking to myself: "But what if I might want to use this sometime later in the future?" I have to stop thinking like that, I have to just get rid of anything that I haven't used in the past few months whether I think I'm going to use it eventually or not.
Mods I'm not too concerned about because I don't have many of them and those all get updated regularly by the creators within days of any update (thank you modders!). But the simple fact of the matter is that every single one of my houses, community lots, households, and single sims are made from about 80% build, buy, and CAS custom content.
As much as I'm looking forward to all these great changes to the game (and the new EP), I'm also well aware of how much I'm not looking forward to all these great changes. *sigh*