Clutch replacment on ASM gearbox

[4x4 tranny]

looking for advise???
boy getting very frustrated with ford transit....lol
Just had to have ASM system fixed up, guys done a wonderful job, but now informs me the clutch need replacing!!!!!!
so looking if some one has replaced one ? what's the procedure? and how difficult? and any advise the guys on here can give.
I've done lots of clutches over the years but none on a transit LOOKs messy?? its the short cuts that makes life easy....lol so any information will well be appreciated.As A guess its done 190,000 ks so expect its the originial, so will have a duel mass flywheel.
So All infomation will be taken on board
thanks in advance.