Replacing the dimmer switch?

My high beams work, but my low beams won't? I think my dimmer switch is bad. Does anyone know if that is a hard thing to replace for a do-it-yourselfer??

I had the same problem and discovered my left low-beam bulb was burned out. After replacing it, both low beams worked as they should. However, a year later, I'm having the same problem again, and this time after checking all bulbs, all of them work fine, but I still can't get the low beams to work. When I find a solution, I'll let you know. I'd appreciate it if you would let me know if you find out how you fixed your car.