The answer depends on your camera. If You have a DSLR, make raw shots, and you can change the contitions laterin Lightroom, Photoshop, or any other program. So automatic WB in most cases is good enough.
If your camera allows you ti verify the shots, do it, and only if you have big problems with WB try manually adjust it.
Try to make photos in difefrent conditions, preset conditions in most cases are good enough, only if you want art, you have to intervene manually. Sometimes different preset conditions do mean different WB conditions. Use the best one in further shots. You may be surprised, the "not natural" WB sometimes is better than the natural one.
Make experiences, and you will discover your own style... Men learn from mistakes.