On good days, I can just act and don't have to think. On bad days, I involuntarily make numbered lists in my head of the steps needed to accomplish a goal and then get overwhelmed at how many steps are ahead of me.

A trick I've found to "harness" it is to consider how difficult the task is overall. Most of those "overwhelming" tasks are just a little bit too much but they're several steps.

If cleaning ten dishes is twice as much as you can bear, your new goal is one. That should be only make out you at 20% overwhelmed. And hey, since your hands are wet, why not hit your limit before you take a break? And what do you know, now you've finished cleaning all of them.