All you have to realize is that covering takes time. A LOT of time. I have covered one plane so far, but I think it turned out nicely. I used the video and articles on RCU and whatever tips people would give (which basically all boiled down to 'take your time').

For the end results of my first covering job, take a look at my avatar image. Keep in mind, that was a kit-built plane and it took me more time to cover it than it took to build. That should give you an idea of how long it takes when you're just starting on covering!