The time has come to tackle the above in

I know it’s gonna be a pain in the ar5e but its gotta be done

Anyone got any tips/advice to make the job very difficult instead of very very difficult

I know that some of the trim bits are now obsolete so I don't want to break anything

so let me have your tips please. Any parts I should get prior to starting the job? Anything else I should do while I’m at it? Has anyone seen a "how to do" write up anywhere on the net?