Thanks in advance for your helpful responses.

I am confused regarding how we go about getting a nice smooth tangency where a part is mirrored over, while we also need draft, as to how to avoid getting a "peak" at the parting line after mirroring over another half.

In the attached image, on the right, it shows a part with draft. If this was mirrored over, there would be a "peak" at the parting line.

If you could, would someone please help explain to me how you achieve both a draft AND smooth tangency across where the part mirrors? 

If you could screenshot a simple model and show it zoomed out and zoom in on the detail at the mirror plane, it would be much appreciated, so I may better understand.

Many Thanks!