In general the best way I've found to use a solder sucker [ the spring loaded , trigger type ] is to use a flat sided - long rectangle blade and then after a few seconds put the sucker as close to the board & solder as possible , but facing the hole flat onto the blade of the solder tip and have the tip well tinned .
The idea being the most vacuum by holding the sucker flat on the soldering tool flat and drawing the sold onto the solder iron .
Not using the sucker to suck direct from the board or component / but again to draw the solder up the tip into the sucker .
This works almost as well as a vacuum desoldering gun , sometimes in one shot .
I've used this technique to remove all kinds of mult-pin through hole chips & components .