[header] How to solder electronics [title] Use a soldering iron with the appropriate heat control. [step] For soldering electrical components into printed circuit boards, the best soldering irons are electrostatic discharge (esd) safe, temperature-controlled, high-power irons. These will let you solder for hours, and are good for complex amateur radio projects. 
For simple kits, an inexpensive pencil iron will do just fine. [substeps] Use a fixed power soldering iron , 25-watt for small jobs and 100-watt for larger jobs with heavy cabling.