I usually make a block to make sure that everything fits and looks good. Then I cut some and sew some. That way I don't get bored and it seems like a different project with each step. I usually buy my borders when I'm ready to put them on. I rarely buy the borders when I get the rest of the fabric unless I want to match the borders with the sashing. I like to buy my quilts in pieces--give me a good excuse to go to the quilt shop.
Sue