Ask HN: Possibly relocating to Mountain View, what to expect?

I've been talking with a company recently about a position I might be taking up with them. I'd be relocating from the Southwest. It's not a lock yet, but I want to know what to expect if/before I get an offer.

I'm curious what other HNers have experienced in terms of relocation packages, and what I should account for myself.

Bonus: How did the cost-of-living change affect you?