I'll throw in a recommendation for the
Sensor Gel Stick (manufactured made by Eyelead), which I believe is the same as the "sticky stick" that AFB linked to. Note that they make a different version for Sony mirrorless cameras (due to coatings on the sensor).
I have had my D7000 for about 2.5 years, and have not previously cleaned the sensor (other than using the auto-cleaning at start-up and shut-down setting). I had been meaning to buy one of those blowers, but never got around to it. After spending way too much time in post cleaning up the dust spots that I started noticing when shooting hummingbirds at f/16, I decided to give the gel stick a try. It took about 15 minutes (making one full pass over the sensor and a few follow-up dabs after taking a couple of test shots) and couldn't have been any easier (unless someone else did it for me).
Here are the before and after shots, taken at f/22 with contrast boosted way up...