I'm not sure where you are in Africa, so stores might be an issue with my "advice." If you are having trouble with the piecing, try glue basting with a washable glue stick first. It will help you as you try to get that perfect seam allowance. If you are now laughing crazily at the impossibility of buying an Elmer's washable school glue stick there, you can try a wheat flour and water paste, a thin one, which will wash out when the cases are washed, which I am assuming will happen before they are put on the pillow form. But now I am wmdering about that. I have a friend in the Peace Corps who is in Madagascar, and it is humorous to look on as she explains over and over to her friends here in the US what living in a third world country means in day to day life. Hang in there. The great thing about quilting is the same thing my mom used to say about accounting: if you must make a mistake, make sure you do it consistently.