Super-vague questions… here are some super-vague answers:
“Have you ever had an experience that you felt suddenly changed your life completely… [?]”
– Yes. Several. Also many other ones that could have, but didn’t because of the choices I made during them.
”… or have changes come more slowly over time?”
– OR? Not “or”, but both/also, yes. They certainly are not mutually exclusive.
“Do expectations make a difference?”
– Sometimes yes, sometimes no.
“If you think everything you know and do could change, does it make it more likely?”
– Depending on what you’re thinking about and doing, and what happens, yes it can, or it can not. In general, though, yes, very much so.
Being open to possible changes does make those changes much more possible. We look for and notice the things we expect and are thinking about, and we behave so as to leave space for possibilities we are open to, and we don’t notice, don’t recognize, don’t believe, distruct and don’t act on possibilities we are not open to.