you can't tell the difference between obvious propaganda and a news organization which tries hard to be impartial?
Of course I can do that. That's easy. The problem starts where you have to tell the difference between non-obvious propaganda and sloppy journalism due to budget reasons.
Yes, your course of action (reading and comparing multiple sources) would help, but boils down to do your own research and become your own expert, just to recognize bad newspaper articles.
And if that wouldn't be hard enough, you would have to be self-reflecting enough to recognize your own bias. Which is harder than you think, because to yourself, bias appears as knowledge. Usually of the "Everyone knows that..." or "Someone who I accept as expert once told me that..." or "It's common knowledge that.." varieties.
And it takes a really scientific mindest to accept that what you know may be completly wrong. (Our brain is wired to work with inaccurate information which is cool on its own, but the opposite of scientific)