It's just plastic, kick it

Yes, I think you can do it by yourself 👍🏼

What is the temperature? Are you handyman? Do you have a heat gun ? Glove? Can you push from the back? The answer is maybe

That's just a piece that clips onto the bumper. You can clip it out fix the dent with your hand and clip it back on.

try pouring hot water on it, saw a tutorial on youtube once

With a heat gun