I have never done scarbo, nbut my teacher has and I have disscussed it with him in the past
He said the main problem is getting the thing into your head. He said once you get going it's fine, but it takes a while to get going. He said that he used to spend 2 hours on it, and at the end of each day could play what he learnt great, and then he's play it the day after, and not be able to, and he said this happened for 2 weeks, then it all clicked into place. He said patience is the biggest key.
Also enjoy learning it, it makes life easier

I get frustrated because i know how I want things to sound, and it doesn;t happen striaght away, but I'm learning to just enjoy learning things.