Stretch the mesh fencing to the T-post.
Stand on the side of the T-post opposite the fencing.
Slip one hook of the T-post clip through the mesh on one side of the post, then slip the rest of the clip around the post and slip the other hook through the mesh on the other side of the post. Attach the clip at or very near the top of the mesh.
Return to the mesh side of the T-post and use the pliers to loop the hook on the clip over the top of the mesh and back through the front, then repeat to create two tight loops. Bend any remaining length of the hook over the loops to support them and prevent protruding sharp ends of the hook.
Tighten the other side of the clip with the pliers and wrap around the mesh once or twice.
Attach clips at the middle and on the bottom of the T-post in the same manner as above.