Part of it was the warning that you might lose your user waypoints and routes, so to be safe they had to be writen down before even starting.
Why should your data be in danger of being wiped by the software, every aviation user must have such data in their GPS, carefully checked and verified in practice for errors.
Matching the screen instructions with the different ones in the instruction booklet.
Then incredibly long authentication numbers and switching between pages. Finding where the files have been put etc
etc.
Finding they had been transferred 'truncated' and having to repeat the performance.
Might not be so bad next time as my data wasn't lost and I have written out supplementary instructions.
Perhaps I am not as forgiving to unfriendly computer systems as I should be.