Using depotdownloader is actually really easy.

Make a text file, paste something like this,

DepotDownloader -cellid 0 -depot 441 -version 39 -manifest -dir "C:\Program Files (x86)\Steam\steamapps\common"

Rename it to a .bat file, put it in the same folder as depotdownloader.exe and run the .bat file.

The difficult part is knowing which tf2 / source depot you want to download.

I started this ages ago but haven't got around to filling it in for a long while.

https://docs.google.com/spreadsheet/pub?key=0AuVlvT2ZETTQdFBDSGVvMlFkT0VqUFR0OXVaaTB2X1E&output=html