Trowel the concrete to smooth out and burnish the surface. Use a flat hand trowel on the surface, being careful to hold it parallel to the surface. Pull it horizontally, alternately working in small arcs, to smooth any imperfections in the surface. Be careful not to tip the trowel or gouge its corners into the concrete—filing the sharp points off the corners of the trowel blade can help. Repeat this process several times while the concrete continues to set over the next few hours.
