Edited to add:
DO be adventurous and buy a very cool 3D puzzle of the Sistine chapel for only $1.00 at a thrift store.
DO finally tell yourself that a puzzle is worth your valuable time and don't feel guilty about making the kids eat at the counter while you hog the dining table.
DON'T worry about the 2 missing pieces that don't show when it's all put together and don't worry that there are some extra pieces that don't seem to go anywhere. Just enjoy the beauty of the thing.