I hadn't pulled that off yet, well, a real song, Two lines and eight measures doesn't count. During my lesson my teacher consistently says things like "just keep going." "Don't stop." as I'm squealing through my song bits.
So, I did just keep going and didn't stop even when I made a few mistakes. (read: a lot of mistakes). I was pretty proud of the fact that I hadn't stopped. I knew my fingering was off several times and my tempo was not as written. The parts that were easier I played at the 1/8 note tempo. The parts that were trickier were maybe more like staccato 1/4 or 1/2 notes. (That means SLOW with unwritten and unexpected pauses.)
Then. After I was done he told me that I had improved since the week before.
There are always buts in violin. I think that's because there are a million things to mess up on. It might be bowing wherein a fraction too far one direction means I play two squeaky strings, a fraction too far the other direction and I play two other squeaky strings. If I really mess up, I play three squeaky strings. Holding the neck of the violin and bow are uber important. Reading the notes and playing them in the proper rhythm is tricky, for me anyway, and uber important. Practicing properly is important. Knowing the different techniques that give different sounds is important. And then there is something else that is even more important. And. I think you need to come back tomorrow for the rest of that story.