One effect of the constant cycling through items which is part of the Autofocus system is that this very process reduces resistance to the more difficult tasks.
To obtain this effect it is important that you don’t just look at a page in general and cross a few items off. Instead you need to follow the instructions and move slowly down the page pausing at each item until one “stands out”.
You can actually measure this effect for yourself. As an experiment the next time you put a task on the list that you know you may have trouble doing, mark the task out of 10 for the amount of resistance you feel towards it. Then every time you pass that item again, re-mark it. You will probably find that the resistance gradually lowers.
This is also one of the reasons why items which still have high resistance should be dismissed in Autofocus. There may well be deeper reasons why you are resisting this item. Therefore it’s important to review dismissed items regularly to see if you can identify why each one is causing you to resist it so much.