No, to set the TDC you need to know the AOB. I don't know which tutorials you speed of but 'step 1' would not be a simple task. Atleast, if you want to do it only by hydrophone bearings.
You can determine the AOB based on the size of the target in the periscope view, based on it's length and height. It was first introduced in a mod by OLC and another mod by JoeGrundman, both assisted by Hitman. But the latest most modern mod is by makman94, the Magui mod:
http://www.subsim.com/radioroom/showthread.php?t=166320
See the 7th image in the first message.