I think I could figure out how to do that but avarage joe should not have to think about that only once, if there would be a button to "share via BT" or something alike it would be useful for average joe. for example its a thing of 2 min to get a BT device into pan with my computer on linux to share its internet connection: install dhcpd configure it and make it start automagical with a BT-PAN as it isnt needed else, do some iptables editing and you are done.
average joe using a gui networkmanager which I dont, he knows how to interact with his gui tool..(I dont) needs 30 sec to change all his connection details which I do in about the same time on the shell (I love TAB completion) and now think of average microsoft joe... he doesnt even know what modprobe or lsmod is! from my own exp. with starting working on in and with linux I know that some howtos are missing basics you need to know. (dont read through what your link reads) average joe needs a helping hand or a button and most of the time he doesnt want a helping hand but a button