How do you decide what to fix and where to post in the last two weeks before launch?

I'm getting close to launching a SaaS, and I've noticed I'm stuck on two separate questions. What actually needs fixing first? I can find a hundred checklists, but they don't tell me which items block a launch and which are nice to have. Where do I post it, and when? Every community has its own rules, best days, and assets it expects. I've already had one post removed for breaking a rule I didn't see. For those who've launched: - What did you check before launch that you're