I started with a metaphor. I told him about the building I was working on, how it was very tall and had sunlight throughout the day, however it got very hot due to the sun and that other buildings in the area did not get as much sunlight due to the building I was in. I was thinking how easy would it be to allow some kind of reflection plates to filter and redirect the sun to the other buildings. I would imagine it could be done with some clever engineering. All you would need would be some way of tracking the sun, working out the best way to filter and deflect.
At that point he started talking about the building's location, the height, what it was made of, and I could hear him thinking, I really could. Then he started talking about a project just like that he was working on.
At that point I stopped him and asked him if he could see that project in his mind now? 'Of course' he said. 'We worked on it for about a year". My response to that was "so you can see pictures and visualise!'.
He laughed and said well I guess I do!
So when it comes to the use of visualisation, I would suggest that having a picture of yourself successfully completing an event would be more compelling then just talking through it. If in the future you come across this, ask the person to describe something to you, like their kitchen. In order to do this, they would have to have an image of the kitchen in order to tell you about it. Then tell them to imagine standing at the stove top looking at the pots (associated). Then tell them to imagine seeing themself standing at the stove top looking at the pots (disassociated).
It's that easy. Sometimes people like to make the process harder than it needs to be. Over the years I have had many people tell me they cannot make pictures, yet after 5 minutes I have them describing things in detail and I can see by their eye patterns that they are making pictures in their mind.
Visualisation, creative imagination, or pretending, are all much the same. Remember that the effects of seeing yourself in the future completing something successfully can make a massive difference to the outcome.