Never touched the rare, but the pin has a small clip in it - this to ensure the pin never gets out. The clip can be removed by hand or by nose pliers. Then, just wiggle the pin and take it out.
While the pads are still in there, carefully pry them apart (by hand or with something - but be gentle and apply pressure for like 5 - 10 sec). This is to force pistons back in the calipers a bit. Otherwise, when you try to put the new pads in they won't fit.
Don't forget to re-insert the clip back and wiggle the pin to make sure it can't get out.