For times when you have a few days ahead, here's the tried & true:
1) season as described above. 7.95 grams of salt per pound of (bone-in) meat. As much fresh ground pepper as you can muster. Lots of garlic powder. Mix it all up in a bowl, lay out some plastic wrap, and use every bit of the rub on the meat. Apply it all over every surface, and wrap it up tightly in the plastic wrap, and refrigerate. It may be helpful to turn the meat a couple times to get the liquid in contact over the whole surface
2) The morning you're going to cook the meat, take it out of the fridge and set it on a rack to rest for about 4 hours. If you don't have one, go buy a remote meat thermometer with a corded probe that'll plug in outside the oven. Stick it vertically into the center of the roast (between two bones) and oriented in the same direction as the bones.
3) Set your oven for 225°. When it's ready, put your roast in and set the alarm for your desired temperature. 119° will give you a good medium rare, 126° medium, and anything above 126° will be too overdone for my tastes. (This can also be done in a smoker, as well)
4) The meat will roast in the 225° oven for at least 2 hours as it comes to temp....probably 3-4 hours, depending on roast size. As soon as it hits that alarm, pull it out and cover the meat in aluminum foil. You don't have to wrap it, but just drape the roast and loosely press to close. Rest it on the counter for at least 30 minutes, but it will be fine for a few hours. This rest time is critical, but it's the only resting you'll need.
5) Set your oven for as hot as it can go. 550° in ROAST mode is ideal. When the oven beeps, give it a few minutes to stay hot, remove the meat thermometer, and throw your uncovered roast in. You're going on visuals at this point. The meat is cooked, you're getting that browned crust here. 10 minutes should get you all the browning you need. Pull the roast out and set on a cutting board. The bones should pull right off very easily.
6) Slice & Serve immediately. No resting is required at this point.