These things always seem to be confusing (at least to me) because of the terminology used, specifically the radial term.
I find it easier to say for example;
I am tracking 250 from a VOR and I want to track 120 to a VOR. This (to me anyway) clears it up to either use the numbers or visualise a picture in the head which shows that a right turn is required. What heading you turn on to intercept depends on how quickly you want to intercept and your distance from the VOR.