Paul,
It's an excellent reference document for Dells although much will apply to other PCs. I don't particularly like the referenced USB creation tool. I have been using rufus_v1.3.4.exe and it works quite well with W7 and W8 both mbr and UEFI.
What seems to be missing is how to create a Window 8 multiple version USB flash drive. That can be done by adding the ei.cfg file to the Sources folder if not present and/or editing the file to look like the following:
[Channel]
Volume
[VL]
1
I haven't tried to load via the above technique as I am waiting for a replacement HD to arrive.
The How-to-Geek site and Paul Thurott's SuperSite for Windows have a lot of very similar information.