I have installed carpet by myself in two different rooms with nothing more than a razor blade. However, the room I intend to carpet next is a little bit larger and I will have to seam the carpet. I've never had to do that before. What equipment is absolutely necessary? Is doing the seam easy?
You will need a carpet iron. I don't suggest trying this yourself as it takes some practice and is easy to screw up.
I've fixed up a few houses for extra money and always used same carpet guys. It looks like they use carpet tape and an iron. But I have seen the difference between they guys with and without experience. You might want to have someone take this room on for ya.