2007 Ford Expedition with 85,000 miles - family vehicle mainly driven by DW. Original brakes but now getting some shaking when braking from high speeds (off the interstate). Kind of a wobble in the seat rather than the steering wheel. I've never done a pad and rotor job but it doesn't look to be overly complicated on the videos and instructions I have watched. I'm trying to figure out if it's best to research the best pads and rotors to put on and pull this off myself or if it would be a better choice to take it to a Firestone, Midas or Brakes Plus locally and have them do this fast? I'm also trying to figure out if resurfacing the rotors is a good way to go (especially with 85K miles) or if it would be better to just put new ones on for a little more cost and use higher quality pads? Input appreciated.