A handheld tool for installing wire on a fence, the tool having a frame, a sprocket system that is situated at least partially within the frame and engaged by an actuator, a T-post alignment unit that is configured to position a vertical T-post against the tool, a clip storage magazine that is attached to a top of the frame, a tube assembly that is movably mounted within the frame, and a presenter that is configured to present clips from the magazine. The sprocket system and tube assembly are configured to cause the clip presented by the presenter to be pushed into position against the T-post and a horizontal fence wire, tension the fence wire against the T-post, lock the fence wire into position against the T-post by straddling the T-post with the clip, and wrap two ends of the clip around the fence wire to attach it to the T-post.