This is a method you can do anywhere any time. I tried it two times, and it worked.
So basically here is how to do it ig:

Relax. You can draw meanwhile, study, listen to music but you have to bring your main focus to your desired reality.

Option a. Visualizing
Imagine yourself in your dr, doing one thing over and over again, but make sure the thing is not too complicated, like swinging on a swing, being pat on the head by someone. As you see these things are repetitive and that's what you gotta imagine. You have to have patience. Slowly add details, like more of your surroundings, don't stop the scenerio (you are swinging on a swing and you notice that there's many trees. The trees have green leaves. Some of them are taller than the others). Make sure to "render" the thing that is right in front of you. After some time it'll become vivid. Than start ferling your reality (the wind is blowing, the birds are singing). As I said add details to this one specific scene.
You'll shift after some time :p

How I did it?
My scenerio was a class. I was sitting on a desk, swinging my legs, looking at my shoes. They were a bit blurry, but I continued to swing my legs. My viev on the world around me started getting less and less blurry as the time passed. There were people around me. I raised my head. They were drawing flowers on the board. It got really hot in the classroom. My skirt was really nice. I shifted.

^
|That's kinda how it went

If ya don't get sth feel free to ask and I'll respond.

"but you wrote option a. some time ago 🤔"

RIGHT-

option b.
Anything else than the visuals of your dr. If you imagine some voices first, it'll be mkre easy to see your surroundings later, and vice versa.
So in short
Just imagine ONE aspect of your dr perfectly, and the others will come easier. But you add details slowly so I called it
The rendering method

Hope it helps yall