1. Metal tab slips under the forward kick panel trim preventing the need for a screw to hold it down. This is the forward end of one piece, the one on the bottom of the pic is turned the other way, so you're looking at the back.
2. Thin plastic blades that have teeth in them. Similar to what you already have. These are pinched in metal clamps attached to the chassis. Notice how many there are on each piece, front and rear.
3. These black tabs simply retain the rubber door opening seal. Hold the seal down while you lift up on this trim for removal.
4. There may or may not be a screw in this hole. You must remove the B Pillar trim (that the shoulder belts attach to) in order to get it out of the way of this lip.