my car's headlamp(the right one) is either burn or wiring problem.Its the normal bulb that isnt working,not the small or high beam.so if want to change the headlamp,do i have to change the entire headlamp or can i just change the bulb?and did somebody posted on how to D.I.Y the headlamp?if have can give me the link.im planning to buy the headlamp/bulb and do it myself.it shouldnt be hard rite?