I agree with the comments that say "do whatever works for you."
I'll try to comment on some different points about visualization that I've not mentioned before.
I never visualized a course until about 3 years after I started autocrossing. After talking to Tim Aro, before we started co-driving, he told me he visualized the course about 30 times and it made his first run seem like he'd already made multiple runs on the course. He explained it in great detail to me and it made sense. Even back in 1997 he was taking people to the woodshed, so I gave it a try. I did it for a few events, hated it, quit doing it, and didn't try it again until 2 1/2 years later when we started to co-drive in 2000 - that was the right decision for me at the time. FWIW, I had some pretty decent years of autocross during that time, without visualizing.
Why did I hate visualizing? If the ideal visualization routine is like a movie of the course, my movie had big gaps & appeared as if I had taken LSD with shots of Everclear

It was frustrating and I seemed to drive worse. When I started to do it again in 2000, it was a lot of hard work! I still had the same gaps, but kept working at it. My sport psychologist friend and Tim kept telling me to keep up the visualization because it was very important. I had hit a plateau in my driving and needed to try something different and this made sense to me. In short, I learned to do various types of visualization and it was a *really* big help.
I made the aforementioned points to encourage everyone to trust your own instincts - there is no right or wrong. Don't be scared to experiment, but do what works for you. I feel confident there will be times in Donnie and Aaron's careers that they will use a lot of visualization. And, I'm sure they would be quick to admit that will likely be the case. I also think they are doing the right thing now by listening to their inner voice! By the same token, there are times when I don't do any visuals or dial it back based on how I'm feeling on a particular day. The weekend of the Arkansas Pro I decided to break from my routine and only do a few visuals total before the event. Whether it was laziness or understanding what I needed, it was the right ticket that weekend.
Though, after driving the course during that event and most others, I often do one or two visuals between runs to help ID where and how I want to make adjustments on the next run. I went back to my normal routine at the Peru & DC Pros and it worked fine, too.
Most of the time I visualize the path I want to drive on course, focus on the "feel" of the car (I think this is called kinestetic), and where I want to be looking. Every once in a while I'll think about inputs such as steering, brakes, and gas, but not much thought goes into those factors unless my core mechanics are off. Generally, these are reactive elements and you should trust those basic skills to just happen. I visualize up to the point where I'm sick of it or have just reached my mental "saturation point," then I quit and don't think about the course again until I literally dump the clutch on Run #1.
MOST IMPORTANTLY, before a long trip with Donnie I visualize how utterly miserable I will be listening to all his deathly boring stories about how he's the god of the computer engineering world and how he took Ricky Rudd to the woodshed at G-Force karts like 30 years ago. I sincerely believe that those visualizations have kept me from ripping his face off on hundreds of occasions. Then, I visualize how I'm going to have to talk him out of going into every single strip club and porn shop along the highway on the way to Topeka (which is a lot). Of course, that is a tough chore because all these places offer a 10% discount to folks with a Class A license (at least that's what the billboards say) and Donnie is all about the 10% discount

Just kidding about all that.
Sincerely,
Anonymous