Whether to fix a squeaky hinge or put on a new door, taking a door off its hinges can be done quickly and easily with basic tools.
When removing the door from the hinges, be aware that the removal of the second hinge will release the door from the wall. Be prepared to deal with that load. An assistant can help to hold the door while you remove the last hinge and gently remove the door from the wall.
If your hinges have been painted over or are extremely corroded, go around the edge where the pin meets the hinge barrel and score the circumference. If there is a lot of rust present, a small amount of WD-40 may help to loosen the pin.
If there is access to the bottom of the pin, place your Phillips head screwdriver on the bottom of the pin, and gently tap it with the hammer to push the pin free of the hinge. It may be a little difficult, especially with hinges that have been covered in paint, so a few more squirts of WD-40 can help to lubricate the pin.
For lower hinges where there is not enough space to tap upwards, use a flathead screwdriver to pry the pin upwards by placing the end of the flathead between the pinhead and the top of the hinge barrel. Press down on the handle of the screwdriver and use leverage to move the pinhead up. Once the pin is slightly free, anchoring the flathead under the pin head and tapping upwards will help to slowly move the pin up and out. Use WD-40 as needed, making sure to wipe up any excess.
With these tips, taking a door off its hinges can be quick and easy.