I have this idea that it takes a while to learn what heavy actually means. I don't mean it terms of a certain amount of weight, but the feeling. It took me maybe two years to learn it.
So, in answer to your question, you don't know what heavy feels like yet - or you probably don't - and you aren't going to learn the mindset you're referring to until you know what heavy means. If you get under a heavy weight just hoping you'll get it or thinking about trying I can guarantee you won't make the lift. Likewise, if you aren't afraid of getting hurt, you aren't even close to maxing out. Spotters don't mean too much when you're maxing, because they won't always catch it in time.
There isn't really a ritual, it's just knowing what you're in for and getting ready for it. Some people get really angry, I try to go very, very still and calm. Either way is getting you ready to not get crushed. You only learn that over time.
TL;DR don't think and don't hope. If think you might miss, don't take the lift. Don't hope because hope means you think you might not make it. Until you've hit a few lifts where you stopped being conscious of anything apart from the weight, you don't know what heavy means or what a max really is.