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I did an 857, it's not too bad, but borrow something with a very fine tip.  The typical $15 iron isn't a good plan for doing it.  It's removing maybe one pad and bridging pads at two other points ...check on mods.dk or similar, there are instructions around.


To remove the one or two smd pads, simply put the tip of the iron right smack on top of the pack, when the solder flows, poke it aside or hit it with a desoldering wick.


For the bridging, I just took a toothpick and made a dash line of flux paste and just dragged solder across for the bridge.


Check your work with a magnifier before you power it back up again.