For Soldering, you will need a decent Soldering Iron, Solder, and a Nipper. It is good practice to solder the components according to their height. Solder the lesser height components first.

You can follow the following steps to solder all the components :

1. Push the component legs through their holes, and turn the PCB on its back.

2. Hold the tip of the soldering iron to the junction of the pad and the leg of the component.

3. Feed solder into the joint so that it flows all around the lead and covers the pad.

Once it has flowed all around, move the tip away.

You can watch the YouTube video for assembling the PCB.