Attaching and removing your bike's pedals might seem a simple task, but without the right size tools and a bit of know-how, it can cause a surprising amount of difficulty.
Pedals are opposite threaded - if you don't know this, you'll have a lot of trouble with your left-hand pedal
Unscrewing pedals might seem simple, but there is one crucial thing you need to know: pedals are opposite threaded - the right-hand pedal unscrews anticlockwise and the left-hand pedal unscrews clockwise.
Place the pedal spanner around the flat section on the pedals and unscrew in the right direction. A longer-handled spanner will give you more leverage if they're stubborn.
Identify the pedal you need - they are usually marked L and R. Apply a little grease to the threads, and finger tighten first to avoid cross-threading, before tightening firmly with the spanner.