The real problem is, I'm so danged familiar with the MySQL toolset.

I've fixed absolutely terrifying replication issues, include a monster split brain where we had to hand pick off transactions and replay them against the new master. We've written a binlog parsing as an event source to clear application caching. I can talk to you about how locking works, when it doesn't (phantom locks anyone?), how events work (and will fail) and many other things I never set out to learn but just sort of had to.

While I'd love to "just use Postgres" I feel the tool you know is perhaps the better choice. From the fandom online, it's overall probably the better DBMS, but I would just be useless in a Postgres world right now. Sorta strapped my saddle to the wrong start unfortunately.

Start learning on the side. Know one well, the time to learn another is much shorter. Bet you could be well on your way in just a few weeks. Not to mention getting away from the Oracle stink.