That's a pretty tough question to tackle. I think my theatre friend once explained something similar to me once about acting a character type he had no "experience" with.
You can take some experiences you do have, an use your imagination to *censored* the context. In my friend's case, he was playing a heroin-addicted runaway who would sell his body for money or a place to stay for a night. What my friend did is he pulled on the memory of what it's like to be hungry, or to be nervous for something important like a test, and he amplified that. He asked himself how that would affect someone's mind under the stress of poverty, and acted accordingly.
That said, what I think you can take away from this is that you can find a similar, mundane, typical experience and reimagine it under different circumstances to create a "fantasy experience" with which you can draw on for your writing.