Time machine!
If you want to remove some solder,here is a tool you should have one-L135A Desoldering pump , which I call “Time machine” .
This Desoldering pump is made of iron and plastic,really tough design.You can easlily undo your soldering with that, give your board another shot.
See the picture above? It works like a “Time machine”, makes your board goes back to the past.^^