Yeah, did a bit wiring up, leads, circuit boards and all that... previous life...
Wired up my guitar yesterday... Don't think my solder is lead free it's all leftovers from 30 odd years ago.
Dunno about USB irons, can't see 'em getting warm enough with the power available.
There was a 'which soldering iron' thread...
Someone is bound to be local, Real simple 5 min job that...