I need a new clutch fitted to my k reg 2.5d lwb transit van, how much do you think it will cost me and how hard is it to do myself????

ive never tryed to fit a clutch before, but if its going to cost to much im going to have a crack at it myself as i cant waste too much money on it what with trying to get the sierra back on the road this year and keeping the escos on the road not much spare cash about

ps ive already got the new clutch