I am having my 3rd bedroom converted into a bathroom, but I think the people who owned the house before me, must have used it as a study, as that's where the BT socket is.
The connection comes through the wall in my bedroom - then there is a box with a lead coming out attached to the wall, then the lead goes to the 3rd bedroom which is where the socket is IYSWIM.
Ideally, I'd like a socket in my room and one downstairs too. Is this a DIY job, or should I get someone in... also, who do I get in? An electrician or are there special engineers that deal with communucation lines?? 
Argh! Please help - I am so completely clueless when it comes to this sort of thing!! 