Which of these happens last? Nina hits a drum.
Nina hears the sound of her drum.
Sound waves travel through the air.
The surface of the drum vibrates, creating sound waves.

it makes them feel like hes not confident

hope it !

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."