Unfortunately for many of us, we may not know if we will like a job until we actually sit down and do it. Then, if we find out we really hate what we're doing, we have to go through the whole job hunting process again, looking for something that we do enjoy. Technical writing, while a noble profession, is not the best job for everyone, even those who think they would love to write just about anything for a living. Although you can still be quite creative, there are definite limitations. Although there is usually some flexibility in the way documentation and help guides can be written, most technical writing is pretty straightforward and impersonal.
Some people pursue technical writing because of the monetary rewards.
You really have to know what you want before you jump into technical writing as a career. This may be true. However, it may also be true that you will be too tired at the end of the day to do any creative writing of your own, or you may feel discouraged by the lack of autonomy you have while working on projects. Sometimes, getting a job as any old kind of writer at all sounds like a good idea, while sometimes you may be better off pursuing your true dreams. The people who seem to be happiest with their tech writing careers are usually curious about technology and interested in helping others understand it.