What makes writing hard?

I have always like writing, ever since elementary school. Well let me rephrase that, I have always loved writing when it is about a topic that I like. It is so much easier to write a five page plus paper when the topic is a good one. It gets really hard when the topic is about something you either do not like, no nothing about, or just do not care about it. For me when I get put into situations where I have to write a paper on something that I am not a fan of, I try to find something about it that interest me. It could be something positive or negative, either way I have found something about a boring topic that I like. Now all I do is put my focus on that and the writing becomes easier because I am more focused. Then again this is something that works for me, it may be different for other people.