Shielding is an easy way to protect yourself. Its portable, strong, simple and you are able to control it. You need to know how to visualize, however.
Technique One - The Bubble
Take a moment to steady yourself and relax. Breathe in slowly, breathe out slowly. Imagine a soap bubble or a bubble gum bubble starting at your mouth. As you breathe out, imagine that bubble getting super big until you are in the middle of the bubble. Make sure that you go slow enough that you keep the image in your mind. Now, really feel that bubble around you, keeping everything negative outside and letting good things come in. Nothing can pop that bubble, not the ground, not others, not anything other than you and only when you want it to go away. Keep it around you until you feel safe again or dont think you need it anymore.
Technique Two - Totem Protection
Some people have a special animal they feel connected to and some people dont know their special animal. If you know your animal, or have one in mind that you want to try, go for it. If not, thats ok too, you can pick an animal you think can protect you, like a wolf, bear, or snake. Im going to use a fox in this example because I love foxes.
Again, steady yourself and relax. Breathe in slowly, breathe out slowly. Now, visualize the fox beside you, as big as you need her/him. She will stay beside you no matter what. Now, visualize anything negative that comes your way is devoured by the fox. It makes her stronger and brighter as she eats it. Anything good that comes your way is shared, as she is a part of you. She will stay with you as long as you want her around.