I can give you more specific instructions or suggest the best YouTube videos to use! Hologram Kits - LitiHolo

Join the four pieces together using tape or glue at the edges to form a pyramid shape.

For more advanced, permanent holograms, you can use specialized LitiHolo hologram kits , which utilize lasers and specialized film. If you tell me:

Trace the trapezoid stencil onto the transparent plastic four times. Cut out all four pieces.