Senior Rough Collie who barks....and barks...and barks!

I'm new at this, so please forgive me if this is in the wrong section.

I have a 9 year old, senior, rough collie named Shannon. She barks all of the time, non-stop, at everything.

Here are the two situations that send her into major barking fits.

1.      I have a piano lesson once a week. Shannon has known my piano teacher for five years and she loves to see him. I know it's perfectly normal for all dogs to bark when there's a knock on the door, but the thing is, she never stops. She barks the whole time he’s here! Before my lesson and after my lesson she’ll just stand there and bark at him.

Everyone who has owned a collie knows that they have high-pitched barks and she's starting to hurt everyone's ears! It’s gotten quite annoying especially since she knows the word “Quiet.” Or does she?

Over the years she has gotten more and more deaf it seems to commands. You tell her to be “Quiet” and she’ll just keep barking in your face.

2.      Laughter. She hates it when anyone laughs. If anyone in my family starts to laugh, she’ll run up to that person barking. 

Those are the two instances where she barks the most.

I've never clicker trained before and any advice would be great appreciated! I've read Don't Shoot the Dog and Reaching the Animal Mind. I'm SOLD on clicker training, but I don't know where to start.

Do I click when she is quiet? Do I put her barking on cue with the clicker and then just never ask for it?

Thanks!