How do you remove a cotter pin from a hand truck wheel?

To remove a cotter pin from a hand truck wheel, first, ensure the wheel is secure and stable. Use a pair of pliers to grip the bent end of the cotter pin and carefully straighten it out. Once it's straightened, pull the pin out completely from the axle. If it's stubborn, you might need to tap it gently with a hammer to loosen it before removal.