The tools you will require for this is a tape measure, a sheet of paper or anything you can write on and a pen. The essence of writing down as you measure is so that you won't forget , because that's likely to happen and so that you can easily refer to your numbers when you need to make modifications to your design.
when your curtains are too short it makes them look cheap and if they are too long it makes them look very shabby. To fix this, always measure the height of your window before you make a purchase, if you don’t have a measuring tape, call a professional to measure and install your curtains.