One of the most simple tests of whether your visualisation skills are up to speed given in the book, is to visualise the parking space you need and then you will receive it.
I tried this twice today – the first time it worked as I found a space in the ordinarily very crowded work car park.
This evening i tried it on my way home from art class – I found a space but it was on the opposite side of the road to where I had visualised. It was a difficulty spot to get into though, and yet I was able to get in first time.
Success then…. to a degree.