Fitting a lining is quite easy, but hard and time consuming to describe in text. Try googling or youtube for the basics and then ask your questions
It is very important to make the lining up square (you need to fit a temporary timber to the bottoms of the jambs to keep the frame square), and you need to fit the lining with each jamb in the same vertical plane - otherwise the door wont hang or close properly
It is very important to make the lining up square (you need to fit a temporary timber to the bottoms of the jambs to keep the frame square), and you need to fit the lining with each jamb in the same vertical plane - otherwise the door wont hang or close properly