To move past the feeling of impossibility, you must stop looking at the finished result and focus on the mechanics.
Accept that the feeling of impossibility will persist until the very moment of completion.
Notice when you say "I can't." Replace it with "I haven't figured out how yet."
Are you looking to apply this mindset to a or a personal habit right now?
Expect a period where effort is high but results are invisible. This is where most people quit because it still feels impossible.
What can you do in the next 10 minutes?