What you'll need
 

Sewing

Sewing is straight forward. Really!! You only need straight stitches. The length of the stitches is important for the look and the quality of your work. Compare it with your original seatcovers. As a rule of thumb you should try 3 mm. Very important is also the tension of the thread. Bottom and top tension have to be adjusted in a way, that the crossing of both threads lies in the middle of the material and the thread is pulled tight. If you're not experienced with sewing then ask for help as this is very important.

I couldn't find any answer on what to do with the ends of the threads. I just knoted them together.