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HOW I BUILT a SHADOW BOX BOOKCASE
The video is not worthless, watch and listen. Nowhere does he say to bend both of the leads at the same time. Bend the longer lead (+/anode). Place the LED in the hole/jig with the short lead (-/cathode) straight up. Repeat. NOW bend the cathode so it makes contact with the LED next to it and solder. Repeat. It's clearly explained at 2:45
How did you hide/cover the dots on the backside?
So how many volts does this put out?
Power LED's - simplest light with constant-current circuit
High Power LED Driver Circuits