17-85 err01 fix (aperture flex cable exchange)

I would say, yes, this is the general procedure for disassembling the lens. It gives direct access to all elements except the back of the large front element and the focus lens. This is a pic of the main internal lens module.

This unit would need a bit more disassemble to get directly at the lenses but you could probably get at them indirectly through the sides. The focus lens is contained in the remaining outer module seen here

The focus lens is directly behind the aperture.

Note: while I did not go into it I understand that the front element is specifically aligned and fixed with adhesive on its screws. In my procedure I noticed the back element is fixed with adhesive on its screws. So I would say these two are the most critical and should be taken the most care with if you should decide to remove them

I hope this is what you were after.

I myself didn't really find this so daunting. so, if you are so inclined at taking things apart its quite doable. however I did find at least one case of someone going in and failing to get things to fix back together so its not for everyone.