Seems like there is no real consensus among enthusiasts on the "proper" way to break in the engine. Some people baby it for 1k while others absolutely drive it hard and then change oil around 1-2k.
The only advice I think is universally accepted is that you should make sure not to drive at a constant speed for a long distance - i.e. don't road trip your car the day after you buy it. Reason being is you want to give the driveline, CV joints and transmission an opportunity to run at varying speeds and loads. Personally, I just tried to avoid passing 5k RPM while open throttle and changed gears frequently.
Once you pass the break in stage, it's good to run your engine hot every now and then to help combat gunk buildup in direct injection engines. Not sure if the N55 uses EGR to reduce emissions, which might make that moot, but still a good idea to open it up every now and then
