Turn your ignition on and your headlights. Turn the key off and then the headlights. They should stay open. Open the hood. Remove the rubber 'bump stop' located next to the headlamp on the side that has the bad bulb. Be careful to not change the location of the lock nut.
Now you have a big opening that will allow you to reach down to the rear of the directional signal and remove the socket and bulb by turning counter clockwise. Replace the bulb. I like to put some dielectric compound or at least some vaseline on the base wires of the new bulb.
Test. Reverse procedure for reassembly. Congratulations....... you just saved $70.00!!! Dave