Nice to know your name :-)
Both applications are quite intuitive... after you get used to them ;-)
It's often easy to start the application, set the source (in Audio Hijack Pro) you need to set the source as an application I think.
Set the type of audio recording (aiff, wav etc)
Set the destination of the recording.
Open DVD player, find the place where you want to record from. Pause the DVD.
Go to audio hijack pro and start recording.
Play the DVD. Stop recording in Audio Hijack pro and there you go. A file of the recording is created! You can now drag that in to Logic.
But, do remember to check the copyright law! It's ok to do this from commercial films etc if you have permission or are using it for home use i think.