One of easiest window coverings that you can make is actually classic roman shades. This is because part of the shades is made out of fabric as opposed venetian blinds where you need equal length wooden or plastic slats to make the blinds. I have summarized the whole procedures on how to make roman blinds below. For a more detail explanation you can watch the video
First of all you need to measure the height and width of the window. For inside mount blinds it will not cover the trim of the window where as an outside mount blinds will.
Assuming that you already have the fabric. So just cut the fabric but make sure the height is about 9-10cm longer and the width is about 4cm wider than the window’s measurement. At this point you should also get the lining ready by cutting the same fabric and the lining should be the same length as your fabric but about 2cm shorter than the width of the fabric
You would have known by now that roman blinds fold upwards when drawn. The folded areas are called pleats and you create them by inserting solid rods or slats into the sewn pockets that you created for each pleat. You need to determine what is the length of each folded area. Measure where you want the pockets to be but they are usually about 16-24 cm between the pockets. You should by measuring from the bottom of the shade to the first pocket which is usually half of the length between your remaining pockets. Just make sure to mark all these measurement clearly. Repeat it a few times to make sure that you did not make any mistakes.
Next you need to plan for the pockets where you want the rods to be inserted. Use the fabric and cut into strips to make the pockets. Make sure you leave an opening to insert the rods. You will then need to sew plastic rings on each pocket but please do not sew them on the lining or the shade. There are usually a row of the rings on each side of the shades. Once all these are done then insert the slats or rods into each pocket. Make sure that the rods are shorter than the length of the pocket.
Attach your shades to the head rail and bottom board. The cut some nylon cords and tie the knot at the bottom ring and go through the rest on the same row and the next one as well. Once this is done you can hang the shades up and test the mechanism to ensure that everything is working fine.