“Don’t be anxious about anything” is a broad command. The point is that where we start our thinking matters. If you start a task telling yourself “It’s difficult” then it probably will be.
Start With “It’s doable.”
When you start with “It’s doable” you’ve got an advantage. You have belief, and belief is invisible momentum for any action we’re starting.
What’s difficult in your present life?
What do you think will be difficult in your future?
Don’t be anxious. It’s doable.
Start there and you’ve already made progress.