How to install pedals on your BMX bike (video)
Fitting pedals takes two minutes – but get it wrong and you ruin the thread in your crank arm. Left and right are not interchangeable, they are usually marked L and R, and they always go in by hand first, never straight onto a spanner.
The video shows how to start the thread cleanly, which way each pedal tightens, and why a little grease on the thread saves a lot of trouble later.