Do I have to be a good writer?
To become a genealogist, a certain amount of writing ability is important. But it really depends on how you want to go about the genealogy of the individual you're looking for. In many cases, it's just simply building a family tree, organizing your data, and presenting your findings. But in many cases, you might want to go into more detail about that individual; their life, the circumstances in which they lived, the social surroundings and contexts. And in those cases, you need to marshal more evidence, and therefore start to construct arguments. Therefore you will need a little bit of a writing background as well.