You change your perception and you enhance your ability to play music, to drive a car or even to perform your work.
Here's a quick way you can change overwhelm into "that's do-able!
If you are thinking in terms of 4/4 time in music, rather than go into practicing it in slow motion, change the timing to 1 and 2 and 3 and 4 and......
So now, you've increased the frame by doubling it and and your perception of the time you need has halved
It's almost like when you film in slow motion, you actually film it twice as fast and play it back at normal speed.