Like Mr.Pro Tools?
Really, it's just attention to detail. I can understand it as a massively difficult craft in the pre-digital era when it was cutting up tape. But, I mean, in this day and age all it takes is the time, the hardware, and the software. Have a nice enough soundcard setup to facilitate recording/rendering of high quality audio, and I guarantee you it's probably, in the end, a lot easier than you're led to believe.