It depends. I rarely look at instruction manuals when it comes to assembaling things, but then I'm fairly gifted in that area.
If I'm working for someone, I will generally do things the way they direct me to, however I draw the line with micromanagers.
I worked at once place, the manager got upset to find that when I clicked on a file in the file directory, I clicked on the name and not the icon next to the name. Despite the fact that I had been doing this since I first started using Windows in the 90's without any problems, she insisted I click on the icon because she once accidentally renamed a file by clicking on the name.
Actually, to rename a file by clicking on the name, first requires you click on it in a manner slower than the double click setting. Then you must type something on the keyboard, or select the past function with the alternate mouse button and, in other words, if you manage to do that, you either must be very inexperienced with a mouse, or not paying attention.
Ultimately her micromanagement slowed me down and I was glad to leave that place. Inept bosses make inept workers.