The place to learn how to solderer is NOT on somithng you care about.
find some old peace of junk to practice on. before you try it on something important.
as your probably noticing, there are many methods and techniques to unsoldering something.
practice is probably one of the most valuable things you can do before trying it on something you care about.
take the advice here, practice on some other junk electronics then do it on the item you care about.
overheatng your pcb and de-laminating the traces is what you want to avoid. Thing is, i would guess just about everyone who has done some desoldering has done that at least once. and that is how we learn.
and .. trust me, this wont be your last messed up soldering job