Don't jump to conclusions, or let's not start celebrating yet. Cautious and borderline pessimistic optimism.
Similar: don't count your chickens before they hatch
Variant: "Let's not start sucking each other's dicks quite yet."
"I just got a letter that said I won a sweepstakes, but let's not start sucking each other's dicks quite yet."
"I just bought PAX tickets on eBay, but the seller had a picture of himself with a neckbeard, so let's not start sucking each other's dicks yet."
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.