A tip for removing the old chip is to add more solder to the pins until you've bridged all the pins on one side. On the top side of the PCB you use a screwdriver or something similar to get some leverage under the chip and try to lift it up. While you're doing that, heat the big pool of solder you made earlier until the whole thing is molten and all the pins on one side are loose. Leverage one side out, then repeat on the other side, then clean up all the excess solder you added with solder wick.
Short of doing it the proper way with a hot air rework station, that's how I would do it anyway
