Hopefully you don't need any of that. Just get the idea. Actually erasure of unwanted things in the Mind has very little to do with toughness. It has to do with peace of mind, willingness to peacefully feel anything in Solo without running away. Willingness for Truth.
Truth is the universal dissolver.
If he finds any tiny error in your solo he will ask you to re-study the course materials covering the error or errors. Lots of re-study untill perfection, even if you have to read everything 100 times or more. In Free Solo you are not required to write down everything you do in solo, but re-studying the material now and then might be a good idea.