Step 4: Cut out the design
Now we just need to cut along all the solid lines. The dotted lines are where folds need to be made, so you don't cut the dotted lines.
The outside shape can be quickly cut with scissors, but the inside lines are more easily done with a sharp hobby knife.
It may be helpful to make some slight notches along the 4 dotted lines that touch the outside of the card to make folding along that line easier.