I have 4 rooms, kitchen and lounge, all with phone jack points installed with cat 6.  Yuss! I thought as the Chorus tech told me this.  Now I can turn all those phone jacks into network points and get the house easily wired up and forget about wifi.  But ... turns out they are daisy chained and this will not work for a network.  Ugh!  Why put in cat 6 and then daisy chain it!?

It's got me half curious now as to how easy would it be to remove the existing cabling and run cat 6 to each of the points?  What would something like this cost approximately, if getting someone in to do it?  I realise it's a bit of a "how long is a piece of string" question, but am looking for a ballpark figure as that will give me something to take to my minister of finance to start the negotiation process.  What are the things that need to be considered / taken into account when wiring up a network?