A good hem on a dress or a skirt should be almost undetectable. Stitches should be spaced just far apart enough to support the hem, not too close together to pucker the fabric and not too far apart...
Talk to them just as friends until you get closer and closer...
Before you tell him you like him, pick up on how he acts to you flirting a little...because if he doesn't react back, then you don't...