Most Cathedral organs involve a marathon to get from console to pipes, or from one side to the other. At Worcester for instance one has to go out onto the roof to eventually get to the pipes! For a tuner I think Sky Hooks come as standard with a set of doubles!
Most parish organs are a nightmare to get into. Usually because the access to organs are universally perceived to be junk storerooms, normally by flower ladies. First job is often to remove 27 old flower stands, 14 vacuum cleaners (usually dating from the early 1960s) and 4 jars of unidentifiable liquid!
Two of my worst experiences were Liverpool Met and Coventry Cathedral. Both have ladders which start off in the basement so you have an extremely long way to climb before you get into the job. The Met has a long ladder in a very small concrete square 'tube' - so narrow that at two points you have to go up on the diagonal as there isn't enought space for your shoulders! not good! One time as I was coming down, I felt something sliding down my leg - after a moment of panic (or was that expectation?)I realised it was my mobile phone, which ended up on my shoe. Imagine the scene - stuck up a ladder, with a mobile phone siting on your shoe. What would you do next?
Anyway, Coventry is slightly better in that there is plenty of space around you, but it results in a leap of faith from the ladder to each 'platform'.
I believe Blackburn Cathedral was a nightmare to get into before the 'recent' work.
On a more serious note I remember, many years ago, listening to a record of Westminster Cathedral. When I read the sleeve notes I saw that the recording was dedicated to 'XXX the organ tuner who fell to his death while tuning the organ for this recording' (Ashamed to say I can't remember who it was)