Good video - i usually use the crocodile clips of a helping hands to grip the other side of the pin i'm soldering, which then acts as a heat sink, but i'm going to start doing it his way. Notice that he didn't actually do it as, probably, all of us were taught, ie heat the component then let the solder melt onto it, not apply the solder to the iron. There was already a bit of solder on each pin and he did just heat that until it melted and apply the solder to the iron and molten solder simultaneously. That's how I do it, but of course you need to get some solder on there to begin with - I use a tin of the most hideous flux (I have to keep it wrapped in tissue because the oil in it migrates out through the gap between lid and round tin, even though it is fitted very tight) - just a dab on each pin so it boils and cleans the surface when the pin is heated, then i apply the solder simultaneously to the tip of the iron and hot pin and the boiling flux allows the molten solder to flow over the pin and form a nice shiny joint.