Its easy to change the brake sensor wire it just connects to the car with two wires and a connector. The connector is shaped so you can only put in one way , although a reversal would not make a difference as I think its just a metal contact switch for when the pads are worn.
$900 seems a lot just to change the pads, for that price I would wanty the discs changed as well.
It doesn't need a special toll unless your buddy is refering to a large hex key. I think its a 12mm one from memory. I actually brought one and it only cost a a few pounds.
Nothing to rest as far as I know.
Good luck
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