1. be in someone's shoes

to be in the situation, usually a bad or difficult situation, that another person is in

2. common as an old shoe

lacking in manners or refinement.

3. tough as (old) (shoe) leather

 Having great physical strength, health, or resilience.

4.  comfortable as an old shoe

Very familiar or comfortable, especially in an agreeably unpretentious or unrestrained manner.

5. wouldn't want to be in (someone's) shoes

Used to express that someone else is in or about to be in a particularly difficult, unpleasant, or unenviable position or situation.