To back up what Kevin said, you mention that you will have "bleepers" which I assume are beacons in case of avalanche. So, there is clearly some possiblity of that danger or you wouldn't carry them. Since you are going with a guide, he/she will most likely have you practice with the beacon before the tour (at least in North America, that is standard operating procedure). If no one shows you how to use the beacon, I wouldn't go on the tour. What's the use of having them if everyone doesn't know how to use them? You are relying upon your friends, and your friends are relying upon you, in case of emergency.
Again, not trying to scare you, just letting you know that going into the backcountry is entirely different than being at a resort. Many people take it far too lightly, and when accidents happen, they are unprepared. Bad things can happen when you're unprepared.
It's great that you'll be with a guide, but he can't do everything. He will need your assistance if there is an avalanche or other accident.
You confirmed for me that you basically spend your time on groomed terrain. I hope you plan to ski a few days in ungroomed to see whether you are ready for this trip.