For the side garnish, if you have 3 or 4 S-clips you should be OK as they also use screws. Main thing is about mid-point on the garnish. S-clips should be pretty tight/secure.
I've seen 6 per side on some, as I recall.
The arched garnish in 2nd photo goes above the windshield; install the A-pillar garnish 1st, before that or the side pieces.
Not sure what that 3rd piece is unless it's supposed to be the package tray molding under the back glass, never seen one like that.
There should also be a molding above the back glass, either 1 or 3 (rt, lt, center cap) pieces.
Don't forget about the dome lamp.
Also, coat hooks: you can use a piece of tape hanging down to help locate them, but you can also feel for the screw hole.