Also have Dish. Much easier if you have a receiver dedicated to the RV. You can buy one and register it to you or get one with the Tailgater or similar type antenna and the Dish Anywhere package. The receiver comes with the package and stays with the RV. No need to recite the numbers on the receivers, Dish has your account number tied to your telephone number with all the receivers registered to you. I used my cell number on the billing info to make the process easier.
If you are within about 250 miles of your home area you usually don't need to call as once the satellites are found they usually automatically work. Further away you will need to tell them the zip code where you are staying and they will send the signal for the stations. If you do that you will probably need to call again once home to have the codes sent to your home system. None of this takes more than 30 minutes to accomplish. If you are taking the home receiver with you you'll have to reinstall it at home and have the power on before you call Dish. If using the Dish Anywhere receiver you may be able to call from the road on your way home.
Another trick you may think about is the iPhone app "Dish for my RV". If you're in a heavily treed area it will be a help to find the best site for your antenna. That said, I've found the Tailgater much easier to set up than trying to get a signal with the home type antenna. A friend we go camping with usually gets his Dish system up and working within a short time. I on the other hand have spent hours getting a signal and our antennas are next to each other. The Tailgater solved that issue.
And I agree wholeheartedly with Roy about practicing at home a couple times before going on the road.
Good luck.