How to boot a laptop from USB (without changing boot settings).

If all else fails try this method.
This asus laptop is 10 years old and has several issues.
1: It doesn't have a working OS on it.
2: I can't change the boot settings. So I can't boot of a USB.
PS: I tried all the meta online fixes and none worked.
Here is what I came up with:
1: Power off pc.
2: Unplug the drive inside of the pc.
3: Insert Bootable USB.
4: Power on pc.
5: Press the bootmenu key.
6: Now insert the drive in the pc again.
7: Save and exit the bootmenu.
8: Check if the drive is detected.
9: Install the OS on the correct drive.
(You might have to change some drive settings and format it before you can install the OS).
10: Finish installing the OS.

[@sambcg]

*IMPORTANT*
This is only for those who have tried all other methods, if you have not tried the normal methods don't try this since you might damage your machine.