Is every person who speaks English a good writer? No, you need to have a good knowledge of grammar, style, and impeccable spelling. Speaking the language is not enough; you need to be a good writer as well.
Another problem is that not everyone is a good communicator. For example, there are many experts on theology, history and mathematics, but that does not mean that they are good writers or good speakers. Speaking the language and being a good writer is not enough; you need to have communication skills - an extraordinary ability to connect with your audience
But the objective here is not to scare you, telling you just how big the problem is. I am here to tell you we have a solution for you. After years of translating training materials, I have been able to create a translation solution. It is the Team Translation System. To learn more about it, watch this presentation.