I don't use a solder sucker, but what I do is the following:
1. secure your pcb with a helping hand or something like that
2. use a clean solder braid
3. heat the solder to melt it first, that way desoldering is easier after
4. apply some solder to your iron tip, if it is possible use the same solder you used to solder the switch
5. locate the braid over the solder pad and then put your the tip of your solder on it with gentle pressure
6. when the braid starts to saturate with solder, move it gently (if it offers some resistance stop! you can lift a pad. Leave it there, apply some new solder to the iron tip and start heating again) so a new piece of impollute braid makes contact with the soldering.
7. do this several times but don't stay too long with the iron over the pad/braid, as you can burn the pcb or melt the mask. While you are waiting, cut the saturated part of the braid.
8. once you've removed a large amount of solder (if not all of it) from the connections do as copachino said and pull softly with pliers while heating with the iron.