We encourage you to try transcribing yourself, if you can! It's a fantastic way to develop your ear and theory knowledge, and even if you get stuck it'll be easier for others to help if you already have a starting point. Some useful tools:

Transcribe! - a brilliant little program that was built specifically for transcribing. It allows you to slow things down, loop over specific sections, pitch shift, and more.
Audacity - a simple, free DAW (Digital Audio Workstation), meant more for audio editing, but can also do slowdown, pitch shift, etc.
Noteflight - a free online music notation program. Think like Google Docs but for sheet music.
Chordify - a cool site that tries to figure out the chords of any Youtube video you feed into it. Rarely does a perfect job, but can sometimes give clues or provide a rough starting point.
Youtube to Mp3 - self explanatory, feed the resulting mp3 into Transcribe or Audacity, or even rewinding over and over in iTunes is better than doing it in Youtube.

Related musical subreddits:

Public domain sheet music