Impossible is easy, it’s ambiguous that kills you.
When the task is seemingly impossible it’s easy just to do the next thing, to chunk it down and take one small step at a time (if you can’t fly then run and if you can’t run the walk and if you can’t walk then crawl)
Impossible is to see a single job in front of you and have to try to find a way through, over or around.
Ambiguous is 1000 possible outcomes, each of which you try to assess and analyse, none of which might come true.
I’ll take impossible over ambiguous any day of the week.