Well, I din't really transcribe whole solos. Because most times, I really only hear one specific thing that I want to take away from it. When I want to put those licks and lines on paper, I learn it by ear first. Then I memorize it. After that, I sit down and tap beats while I sing it and try to visualize how the rhythms will be written, then I write it down. It's not that, my advice for your first time: don't try to do the whole solo the first time, it will take you FOREVER.