If you didn't know what a solder-sucker is, then you probably aren't an experienced solderer. If that's true, you stand a good chance of damaging the chips no matter what you do. To take out soldered-in chips you need a steady hand, a fine iron at exactly the right temperature, a solder-sucker, and lots of patience and practice.
You could always practice your technique on junk and stuff. If you see discolouration of the PCB or chips, then you've burned it. If it was real life you would have destroyed your ram chips. Be very careful.
