Have fun at Northstar. This resort has significantly rebuilt and developed over the last couple years. Frankly, its kind of isolated and while it has "village" restaurants and lodging, all of my experience is away from there. Its in easy driving range of Reno, Truckee, North Lake Tahoe, so there are tons of places to go.
Skiing is beginner-intermediate on the front, and the backside diamonds are really intermediate to advanced depending on grooming (steepness is not an issue). There are some difficult runs down the gut of Lookout Mountain that are steep and moguled, and that is also the best place to be during crowded conditions (weekends). Lookout has 2 groomed, relatively steep runs that you should be able to handle.
You sound anxious about your skills matcing to the terrain. Don't worry. Experts derisively call Northstar "flatstar", a title it doesn't deserve unless you're inclined to ski expert terrain at Squaw, Rose, Alpine Meadows, Sugar Bowl, Kirkwood, etc. Northstar hasn't got one single cliff drop, couloir, or cornice or rock exposure that I'm aware of; thus the title. Northstar gets less snow than many other resorts because it is not on the Western Slope, is a lower elevation, and is in a precipitation shadow. By the same token, its relatively sheltered during storms and wind events and the trees preserve snow well. End of February should be great. If you are up for a bigger challenge, there are about 15 other ski areas nearby.