I find that the time that goes by is actually your best friend when you are making a record. The passing of time gives you perspective on what you recorded and what you wrote. If something sounds good to you 12 months after you recorded it then chances are pretty good that there's something valuable about the part or the song.
I got this Christmas gift with the entire Beatles catalog. I had fun trying to duplicate what I was hearing on these records, only using the instruments I had at hand - an acoustic guitar, and that's all. It was endlessly amusing to me to try to imitate John Lennon and Paul McCartney's harmonies using the guitar.