Here is an instruction how to install the door handle scratch guard stickers:
Same procedure for all patterns (British Jack flag as example here).
First step: Make sure the area behind the door handle is clean before installation.
Second step: Spray water over the area behind the door handle evenly (make sure the whole area is wet).
Third step: Find the center of the area behind the door handle, locate the center of the sticker to that spot.
Fourth step: Press the sticker from center to the edges and make sure all water underneath is squeezed out.
Fifth step: Let it air dry.
You can remove it anytime. Just peel it off (it will not do any damage to your car).