Shielding. This is a technique for creating a magical 'force field' around your person or a place, to keep out unwanted energy. This could be psychic 'background noise', nasty astral critters, or magical energy directed at you. Many people do this unconsciously all their lives. Others of us have to learn how. The method I use is to visualize a 'net' of energy around the area to be shielded. Remember to 'see' it in 3D, a sphere rather than a circle. (This is where those visualization exercises come into practical usevisualize negative energy being absorbed by my shields and flowing into the earth. ("Ground and Center" here.) Visualize it as porous, though, so that energy can pass through. With practice, you will be able to shield yourself instantly, without thinking. exhaustion or alcohol quickly erode my ability to shield, so keep this in mind. Once you have shields, there is lots of nifty magic you can do with them.
Warding is a similar technique,a Ward as a Shield anchored to a physical place. Instead of using your energy, though, you let Earth energy flow upward to power it. With practice, you can create a stable, Earth-powered shield. This leaves more energy for spell work, or allows you to drop your own shields and recharge. Reinforce the visualization regularly, and it can be permanent, to protect your Circle or home.anchor wards with physical objects-a stone, carved runes, etc. But it is the visualization that really matters. If the mental image fails, the shield will fail, no matter how many runes you carve.
A few shielding tricks. First is the mirror.visualize the outside of my shields as a perfect mirror, reflecting any energy back to it's source. Next is making the inside of your shields a mirror. Last is the 'iron wall' or 'stone tower' visualization, changing the thin energy shield into a massive fortress. This requires a lot of power, but when huge waves of negativity are breaking over you, it really helps.
The most basic technique is calling White Fire. This is the Light energy of the universe, the silver-white of the Moon and the fire-white of the Sun, the sum total of the magical Elements. Let it flow in from all around you until you feel like a ball of lightning, then send a directed bolt of it back in the direction the negative energy came from.
If this doesn't work, you can still call on the Lady and Lord in their warrior/protector aspects to help you.
Using a 'space suit,' with helmet as 'body armor.' This is one that can be donned rapidly and then discarded, being sure to turn it back to the Universe as pure light, after it has been thoroughly used and 'beaten up.' (Know that we can "clutter up" the psychic realms, just as some cultures have cluttered up their human environment, and as we have cluttered up the near-Earth environment with satellite debris.) This approach is one that is easily applied before 'mixing it up' in a crowd, such as shopping or a party. Obviously, the materials you designate should be quite flexible, such as a diver's wetsuit, but you also need to include whole-body (hands, feet and head) protection, such as the space suit.
Putting a fence around yourself.
If you truly want a protection of this sort to be effective, be sure to think in three dimensions, rather than the normal two dimensions for a standard 'fence.' By that, I mean to enclose all of you, around, top and bottom. Although most of us think in terms of a squared-off design, realize how strong an egg shell is for its relatively thin wall thickness.
And what about your living area, your house, for example? What if you want to provide protection for your home and family? The same principles apply. Just be sure to, again, make sure the materials and design is strong enough for what you might envision as a 'likely' onslaught.
Also, why be limited to one material or thickness? why not use layers of different materials, or a even 'new' material that hasn't been invented yet, but is 'tunable' to your particular needs. Remember, working in this realm, you are, again, only limited to your own imagination, yet the effects can be felt in the physical world.
Put up "active" psychic mirrors to reflect negativity. Using a one-way mirror, you can automatically send your love through from the backside. Or, if you can't manage that, send God's love and/or light to those that might do you harm. This can be a very effective tool.