I saw a really good noddy's guide to replacing it on another Land Rover Forum. Hope the Mod's don't ban me for saying this, but if memory serves right it's the LRO site in the FAQ's/tutorials...
It looks like a pretty straight-forward job if you can weld. I think the guy who wrote it did the entire job in a weekend, so all's not lost!
If you can't find this, let me know and I'll PM you a link (presuming of course I can find it again too..!)
Hope that helps?
Malcolm