if dosh is a bit tight at the moment,1 thing that id recommend doing is make up a door stand,out of an off cut of 4x2,cut it in the middle about 2 inches widex2 inches deep with 1 side at an angle then cut a wedge bit of timber,hey presto 1 door stand,lay door in between the gap and gentle tap the wedge in and you can work on the door to your hearts content without it falling over.