Start by putting on the dress with the waistband under the bust and the straps over the shoulders.
With the straps over the shoulders, tie a knot into each strap. The height of the knot can be adjusted to your own preference
Use the pinch and guide technique, keeping the straps nice and wide while wrapping them around the bust. Wrap the straps around once, or twice, depending on your size, comfort and how long you would like the straps to be.