Threading
Prepare a waxed thread about 3 to 4 times the distance to be stitched, stick the needle through the thread 2 or 3 times about 5 cm from the end of the thread at about 7 mm intervals, and
Pull the thread through the needle hole and pull the thread through the needle to the thread end. Since two needles are used for sewing, attach both ends of the thread to the needle.