Homebrew PCBs

If your pad is solidly connected to the plane, that's normal.  Your EDA 
software should have a way to make a thermal barrier around the pad, 
which not only keeps the heat where it's supposed to be, but also the 
solder:

http://www.delorie.com/pcb/docs/gs/gs.html#thermal

Otherwise, the trick will be to (1) flux the lead, and (2) apply heat to 
both the lead and pin while applying solder to the other side of the *lead*.