In my 2010, the bulbs are not bulbs; they are led's soldered on the circuit board. As far as relearns with the new cluster, they would probably need to be done but that's not a big deal. When the dealer installs a new cluster, they use the Service Programming System to transfer the mileage from the old cluster. With the car already hooked up for the programming, the relearns will hardly make any difference in the labor time.
I unplugged my cluster again after I did my relearns to correct the pins (I didn't get the tach and speedo pins on quite perfectly when I had the cluster apart) and I did not have to do the relearns again when I plugged it back in.
I don't have any personal experience with an 08, so hopefully someone else can chime in to confirm whether 08 and 10 are close to the same. Your cluster does look like the one in post #22 minus the button in the tach, right?