guy did mine for free. its fairly simple, so if i were to pay no more then $10-20 probably.
Same here. They did it for free, took 5 mins.
It's really simple if you have the right tools (which a bodyshop will).
If you're really hell bent on doing it yourself, you will need to drill out the old rivets and you will need to use a riveter (you can get one at home depot or lowes) to put in the new door.