Conor, it's worth mentioning that Saab Dastard's and Whopity's techniques are both valid, and both use the triangle of velocities, but solve the problem on the wind computer in different ways. (They are called "wind up" and "wind down" if I remember correctly).
The SD method requires a jiggle (typically you have to do the calculation twice) and Whopity's gives it to you in a single step.
You probably don't want to learn both at this stage (in fact I know ATPLs who refuse to learn the 'other' one
) - your best bet is to get an instructor to show you one way and then stick to that.
Good luck!