Not hard at all penguin, just DON'T pull the clips out, they push in I believe. They are very easy to break on the 05's, and of course ford stopped making that style clip. I would have my tires rotated and an alignment if it's not been done recently.
^^^^My little vacuum gauge was reading ok. But that reading depends on the gauge itself.....the internal filter still could be partially clogged. I didn't trust the gauge reading.....and I was correct.