i've heard people getting it done for around £800 inclusive of parts, its a (fairly) big undertaking, and you would want to get it done properly for obvious reason...
Hopefully someone who has done it will step in and give some exact figures and a good summary of how ahrd it is...
Whats wrong with the auto mate autos can be very quick take jay for example he was pushing out 200 hp autos are quicker on takeoff and aren't that much slower then manuals and at the end of the day by doing a manual conversion it would have been cheaper to buy a manual in the first place