Sharp tools make good work. First of all, he must have good tools, such as soldering iron, tweezers and a magnifying glass if necessary. A workbench is also necessary. First, fix the PCB board so that it won't move, carefully place the components, align them, and then press and hold the components before soldering. Pay attention to the higher temperature of soldering iron and shorter welding time. Weld one foot first, then let go of welding, and the time will be a little bit.