You will need a decent iron to melt the existing solder. Make sure it can get hot enough and more importantly has a tip of sufficient mass depending on how much metal is connected to the joint you are heating. I would skip the desoldering irons as it is basically a soldering iron (which you will need to buy anyway for reinstalling your caps) attached to a bulb pump.
Then all you need is a solder sucker to remove the old caps. I've used the cheap plastic $5 ones but the one I recommend is the Engineer SS-02.
http://www.amazon.com/Engineer-SS-02-Solder-Sucker/dp/B002MJMXD4
It has a flexible silicone tip that can withstand the heat of the iron. Just place that sucker (no pun intended) over the whole joint while your iron is on it, and it will form a seal around it for effect solder removal.
Then all you need is a solder sucker to remove the old caps. I've used the cheap plastic $5 ones but the one I recommend is the Engineer SS-02.
http://www.amazon.com/Engineer-SS-02-Solder-Sucker/dp/B002MJMXD4
It has a flexible silicone tip that can withstand the heat of the iron. Just place that sucker (no pun intended) over the whole joint while your iron is on it, and it will form a seal around it for effect solder removal.