Having made umpteen million test fit muslins (seriously. 20 years worth, still working on it), I have come up with a fast and accurate method for sewing darts. This works for the regular pointed dart like a shoulder or bust dart, as well as the double pointed 'fish eye' dart.
For this method to work, you'll first need to mark the center stiching line on your machine. I drew mine with a fine sharpie, but you could mark it with a sticky note.
Next you will need to mark the dart. To do this, use two small clips for the dart ends and a small drill hole 1/2 inch from the dart point. To mark the drill hole, use a machine needle and poke through the two layers of fabric. You do this a half inch away from the dart end because otherwise the hole might show through.
half inch past the drill hole.
Next sew the dart, but here is the trick:
Sew the dart aligning the end of the dart with the center sewing line.
Finish by stitching exactly to the end of the dart. Then stop with the needle down.