Tom's method is what I use when replacing commodity parts that I don't care 
about salvaging.  Much less chance of damaging anything.   Hack the part apart, 
 cut the leads on gull wing packages, etc.  Don't waste your time with 
tweezers,  lifting one end, etc.   I have a very nice set of hot tweezers and 
almost never use them.

And for DIP packages cut the package free from the leads first...  even though 
I have a $6000+ vacuum desoldering station,  trying to get all the leads 
unsoldered cleanly and prying out the chip always risks tearing out a feed 
through... particularly on multi-layer boards with out thermal isolation vias 
on power/ground connections.

-----------------

>  I usually nibble away at the center of the part until it is two separate 
pieces. Then unsolder each piece. Clean the pads off with wick then install 
the new part.
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