Jolands,
For the BT update there is no need to install the one on the first card as previously recommended. Simply insert BT update card into the unit go to the BT settings menu, scroll to the bottom and hit the firmware update button. It takes 5-10 minutes and will tell you that it's complete.
BT should work with all available blackberry phones on the market. I personally have a storm 2 and it works fine. I wouldn't worry about that.
As for the install of the upgrade, simply power on your unit, insert the card, enter the numbers requested and you're done in about 25 min.