Congrats to you on replacing that in such a short amount of time. I believe you got the exact same model I did for my brand-new house.
For those attempting to do this in the future, if you buy at a store be sure to ASK about any extra hardware that will be needed for the installation. I got mine at Home Depot on a sale and the guy told me exactly what I needed extra to mount this sucker. Boy was I glad I listened to him because Chamberlain did NOT include all the hardware you need to install their opener. According to the Home Depot guy, NO manufacturer includes all the extra metal braces and nuts/bolts you will need to hang it from your ceiling and install it over your garage door. You'll also need a small piece of 2x4 to nail between studs.
Having said that, it was actually quite straightforward and the instructions were quite easy to follow and I want to do this again on the smaller door (my house has a 3-car garage) with the same model.