It's fine, just keep me posted with any trouble/things that are unclear. I'm more than happy to help, it feels good to be on the other side for once .
Just so you know, you shouldn't install the boot-loader to the disk where you have Windows installed (if you do), it will mess up the Windows boot-loader.
I just noticed the commands I posted would put boot0 on disk0, and you want it on your USB drive. There are many guides on this, google them first!
Good luck!