so, if it's stranded wire, and you're short on hands, apply a little bit of blobby solder to the twisted stranded end. then, apply flux and the flux will wet the wire such that capillary action draws the solder into the wire bundle. after this happens, your wire will be "tinned", and should look silvery (because it has a coat of tin and lead on it). now, solder "sticks" to solder when heated, so put a little bit more blobby solder on the tinned wire, put a little blob of solder on your tip to serve as a heat bridge put a drop of flux on either the pin or the wire's block, touch the wire blob to the pin and then maneuver your iron to where your heat bridge is touching the blob on the wire and the pin. pull the heat back as soon as the solder melts and then hold the assembly extremely still (this is where a proper wire holding (pana)vise really helps) and you should get a good joint. if you don't (which is A-OK), put the assembly in a work holding device, put another drop of flux on the bad joint and heat for just long enough for the solder to melt, then pull the heat back.