I would strongly advise you apply heat syncs when doing this, otherwise you can end up frying components near the headphone socket (I've managed to do this before when using old solder that wouldn't melt easily)
Another tip, use the smallest tip you can find for the soldering iron. if all you have is a chisel tip, don't use it. it's too much risk!
lastly, make sure you clean up the old solder. don't mix new + old
I also recommend looking at some soldering guides. it's easy to do a bad solder and make stuff even worse.
<cybojenix> Every single language makes sense. They're logical
<cybojenix> Then there's just Perl.
<helicopter88> perl just looks like an esotheric language
<cybojenix> Perl is what came out from those monkeys trying to recreate Shakespeare
<helicopter88> cybojenix, this is the wise sentence of the month