Starburst effects can add an interesting element to a photograph. In a dark scene, it can add a dreamy, peaceful twinkle to the lights. In a daytime scene, a starburst sun can add drama and interest (Diy Photo Lighting)
To be comfortable shooting manual, you will need to know what your necessary adjustments are. Though these settings are all numeric, there isnt some insane math equation that you need to do to find out what to dial.
Awesome tutorial on making your photos soft & vintage looking. How to add a "Soft Light" to your photos using Photoshop & the shortcut to easily "Mass Editing" photos with the same effect. Photoshop tips.
I haven't checked the actual web-site as I don't use Photoshop, but I love the effect and can see me using this myself. Where I pinned it from said "How to Create a "Double Exposure" in Photoshop — Daily Epiphanie"