Desoldering vacuum tool (solder sucker)
This tool is useful when cleaning up soldering mistakes, but it isn’t necessary for
assembly.
If you plan on doing some hacking, modding, or hardware repairs in the future,
having this is always a good idea.
Additional useful tools
Helping third hand with magnifier
This could make your soldering experience a little more enjoyable, especially when
doing some more complicated projects.
Multimeter
A multimeter can be used for many things: testing tricky connections, measuring
battery voltage, testing resistors & capacitors, measuring the current consumption,
and more.
