Soldering

It's quite hard for me to solder them cus I never soldered anything before. Lots of things should be concerned for safety.

Soldering Iron Safety 

• Never touch the element or tip of the soldering iron. They are very hot (about 400°C) and will burn.  Actually, I use 300°C when soldering.
• Hold wires to be heated with tweezers or clamps. 
• Keep the cleaning sponge wet during use. 
• Always return the soldering iron to its stand when not in use. Never put it down on your workbench. 
• Turn unit off or unplug it when not in use. 

Soldering Safety:

http://naples.cc.sunysb.edu/Admin/HRSForms.nsf/pub/EHSD0348/$File/EHSD0348.pdf