Well I ask because, tethering will cost you, well unless you have a package with your provider. I have used the mobile hotspot app from extras and it doesn't cost me anything, and it works really well!

I don't know much about the tethering aspect, but I will try and help, but if I was you (and didn't have a data tethering package), I would get the hotspot working instead, because it will save you money and headaches

The install of the power kernel (any of them) is easy and so is the install of the app, what way do you want to go: fix getting the kernel/app working or stick with tethering? I'll try and help with either.

I have recently moved, and the hotspot saved me until the sky guys installed my broadband so I feel your pain