I would say the same thing for somebody who bought a grip truck and a bunch of lights last week and expects to know how to light this week. Realistically, it takes at least 5000 hours to become "expert" at anything -- and I would include sound, color correction, editing, and cinematography in those categories. Each of them is a very difficult craft that takes years to master.
I would never assume that just because I own Final Cut Pro that this makes me an editor. The same is true of color-corrections software. I can dabble... but I'm not really an editor. I do know color and sound, and I stick with those areas because those are my areas of expertise.
Or in one sentence or less: you get what you pay for.