Showing my ignorance...brake pad replacement?

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Front disc brakes will wear quicker then your back drums, mostly because more of the braking power is on the front. You probably just need to change the front pads.

but if you are paying someone to do them, might as well get all 4 done at once

 

Not certain about your 2006 model, but the front pads on my 1999 4x4 are extremely easy to replace. The only tool I needed was a pair of needle nose pliers and a large c-clamp (to retract the caliper pistons). Do it yourself, but get quality pads, and some white lithium grease for the pad pins.

Assuming you have drums in back ( shoes, not pads), I wouldn't replace the shoes unless the lining is over half gone. Much more difficult to replace. You can check them by removing the drums for a visual check.