how to replace front valence/chin spoiler?

I damaged my front valence last night by pulling up too close to a curb.

I did a little research, and they are not too expensive to replace, apparently (around $85 at the dealer).

My question is - has anyone else replaced one yet, and if so, what is involved in replacing it?

Underneath, there are regular screws, and also the smaller pin-type with some sort of lock washer above. From looking at it, I can't see how I can get my hands in there to where the two center screws are located, but I may be overcomplicating things.

Any tips? How do those little pin-type screws come out and go back in?

Thanks!

Yes, that looks like the ones. So, if I unscrew them from underneath, will the back part stay in place? I can't get to the top of it to hold it.