I have a few pieces of the Blueberry set I don't want, I have them in my MP folder, but would it be better to set them out at an actual yardsale?

depends. I think people do both if they want something specific

you could try yardsale for a week then MP it

hopefully people buy them either way, because I KNOW I can't be the only one looking for pieces for Belleza's Isis body

now which yardsale should I put them at? the Seraphim one?