Share your transcription tips!

Not sure if this is quite relevant under composition but.... I heard this AMAZING piece last week, and it's literally making me want to play piano again. 

Unfortunately, the only sheet music I can find is ridiculously expensive, as it's not a well known piece. So, I thought I'd use this as a chance to practice my transcription skills (as it is quite a minimalist piece anyway).

I had a quick search on Tonebase but couldn't find any lessons or forum posts about how to transcribe piano music, despite it being (I guess) a pretty useful skill, especially for training your ears... 

So expert transcribers out there - any tips for a newbie? Or any resources, books, videos you can point me to to help me get started? 

Thanks!
Sam 
31, London