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Channel technique: Replacing a Background.

Channel technique with a twist: Whispies.

You can also use Pen tools to make a selection for a mask. Might want to brush up on Pen tools if you aren't familiar with them. Intro to Pen.

I've seen a movie that uses Extract with an Alpha channel. Pretty good results. Not sure if I can find it, though.

Also recommend: How not to be destructive with data and save your sanity, which kind of deals with Eraser tools if they are your thing.

As for me, I like to paint out my mask. Grab a brush, set Hardness to around 90%, and paint away. I've been doing it this way for so long, I can do speed masking, around 1.5 minutes or so.