I suggest you look up the video walkthroughs that are already out there to see how some of it is done if you get stuck and what you are doing wrong. It's hard to describe what you're supposed to do since a lot of it has to do with timing.
I meant the ones on YouTube. There are solutions by two different people. I've used the second one but don't remember if they show how to do levels 100% or just the birds.
