I applied online without knowing anyone who personally worked at Best Buy. It was right after the holidays. I heard back from the store's HR person (a position that is not typical at the retail locations). She scheduled me for an interview within a couple days with the person who would be my direct supervisor.
My first interview, with the direct supervisor, was pretty standard. Questions about how to react to theft, difficult times with a former employee/colleague, difficult times with a customer, strengths, weaknesses, etc. It helped that my direct supervisor was a video game fan, it came up during the interview and we got to talk a bit about video games -- definitely showed him I knew what I was talking about and could hold a conversation with a stranger!
From there, my second interview was scheduled with a customer service manager. This interview was more of the same -- but more questions about your background, what you do in your spare time, how you would react to specific customer situations and about your experience/goals.
Third and final interview was scheduled with the store manager -- the boss hog! Once you make it to this point, you've pretty much got the job. Supervisors and managers are held responsible if they waste the store manager's time with a prospect that will not fit the culture of Best Buy or make a good salesperson. That's not to say, however, that you can't be rejected at this stage. If you say or do something that the store manager doesn't like he can reject you. However, if your brief interaction with him goes well, expect to be made an offer and to be asked to sign paperwork confirming your employment.
After I accepted my offer (which was low for all of my experience, but I needed the job) I was scheduled to begin training/orientation. It was a three day process, held over a weekend. Expect the usual; going over dress code, all of the company acronyms, basic responsibilities, how to clock in and out and tax paperwork.
Next, you'll shadow employees in whichever department you work in. I personally worked in computers, digital cameras, MP3s, car audio and gaming. These were the areas I was responsible for, but when you work at Best Buy, be prepared to sell everywhere. Don't know anything about TVs? You'll learn. You'll spend a lot of time taking eLearnings about the various products, services and solutions offered by Best Buy.