If the fan has a slide on bracket you can leave the mounting bolts on the junction box and simply slide the fan bracket. 5 install light bulbs glass shades and pull chains following the directions provided by the manufacturer.

Ceiling Fan Light Kit Installation Temecula Handyman
Installing ceiling fan light. Attach new electrical. Remove the existing light fixture. Remove box and cut new hole. Remove the old electrical box from the ceiling. Ceiling fan overview step 1. Connect the green wire to your household ground wire copperbare wire.
Remove the safety wire nuts from the power wires and match the white wires the black wires and ground wires. If its nailed to a joist pry it. Make sure electricity to circuit is turned off and carefully remove the glass. Run the wires on one side of the pin in the downrod ball. Install the wire nuts and wrap electrical tape tightly around each of the paired wires where they enter the wire nut. Thread the main wires through the center of the mounting bracket.
Tuck the wires back into the box. Connect the red wire in the ceiling to the black wire in the light kit and the black wire in the ceiling to the black. Next secure the mounting bracket to the box. Installing the ceiling fan step 1 for a fan with a downrod thread the wires through the canopy trim ring if applicable canopy and downrod. This attachment should go smoothly especially if you have purchased a lighting assembly designed to be attached to your ceiling fan. Connect your white wires together and secure with wire nut.
Lift the ceiling fan motor unit into place and have an assistant support it. Screw the lighting assembly onto the ceiling fan. Always be sure to follow the manufacturers instructions.