Step 5: Soldering through-hole components
On a one layer PCB insert the component and bend the leads slightly, just enough to keep it in place while you solder it in place (Fig 6). While keeping your soldering iron at a 45 degree angle to your work, let the tip of your iron contact both the lead of your component and PCB at the same time. Apply the solder from the opposite side from the tip. Heat the surfaces until solder flows freely to the tip side of the work (Video). Be careful not to overheat the pad as this can damage the PCB by lifting the pad from the board.