Sewing is an art and people who know how to sew efficiently are nothing short of artists. Sewing requires elegantly doing all the stitches and the hems and carefully operating the sewing machine. Beginners require quite a lot of help with sewing since it is their initial experience and they are not aware of the know-how of sewing. Thus, more often than not, they tend to make mistakes. It is important to learn this skill from experienced people. Thankfully there are plenty of information available online, for example this site is doing an incredible job in educating public how to sew and everything else related to sewing.