Buyer beware. I saw these instructions, but still wanted to have the dealer install. I went to 2 dealers. One of them wanted to charge me 3.5 hrs at a rate of $100 per hour, while the other charged me 1.0 hrs (like the instructions say) at $110 per hour. Both offered and matched the same price of the HW kit.
Actual time for a tech to install, who never performed this install before? 50 minutes plus the SW upgrade which was handled seperately. Evidently SW upgrades on the E-90's can take anywhere from 20min to several hours. I was lucky at 30 minutes.