Putting puzzles together calms me down. Is it the sense of control when I pull out all the edge pieces and slowly make a frame? Or when I sort all the colors into grids on the table? Everybody has a different approach, I've discovered, because many people pass by my puzzle table, well, dining room table, and give it a go. I don't mind. Help with puzzling is fine with me.
My husband likes to sort the pieces by shape, so when he really gets involved it blows my system out. Our daughter works well that way too, being a wizard at visualising what fits before she tries it, and our son is pretty flexible and can work with anything. Our son-in-law fits with my rough sort without complaint. And in the end, it comes together.