It really is a very simple technique and the more you do it the quicker and easier it gets, you also build up a kind of resistance.
First stand on the ground, dirt/grass is best but any ground is fine. Breathe in and out and imagine your feet are the roots of a tree that go deep into the ground. As you breathe in and out imagine the roots going deeper and deeper.
Then imagine you are being cocooned by white light. Imagine this light is coming from the universe and that it covers you completely from under your feet to over your head. Imagine the universe is spinning a white light of protection about you. As this is happening ask your guides to ensure that nothing negative or neutral can get through this protective white light or inside it. Ask that only that which is sent by the light or your guides and only for your higher good is allowed through the white light.
Do this before and after work. When driving home do the white light exercise for your car as well.
