"He still did it wrong! With the door closed remove the tension from
the
springs first. Then disassemble the door, starting with the top panel.
assemble in reverse order! "
Greg


And how is one supposed to remove the tension from the springs with the
door closed? The standard way is to raise the door which takes most of
the tension of the springs, use some channel locks in the tracks to
make sure it stays there, then remove the springs. After that, with
someone helping you, remove the channel locks and you can slowly lower
the door, which can be a couple hundred pounds, depending on type and
size.