-http://www.realmagick.com/articles/65/1965.html by Anja Heij
When you practice magick on your own you can visualize any form of energetic shield. Use your imagination to create yourself the best one, or use these examples:
visualize a circle of protection around you, or better said a three dimensional globe of protection, keeping all negative vibrations out
imagine a pyramid of gold; through the top it supplies you with pure, cosmic energy, and the golden sides reflect all negativity
use first the circle and then put the pyramid over it
create yourself an armour; it can be a reptile-looking Starwars armour, a medieval steel harnass, whatever you want and don't worry if it looks comical, you're the only one who sees it
put an energetic ring of fire around you, with flames too high to be crossed by any enemy, or with flames consuming all outward negativity
a veil or net that lets in positivity and keeps out all forms of negativity.
visualize the color cobalt blue around you; it can take the shape of a cobalt blue aura, globe, room or temple, whatever you want. Cobalt blue is famous for its protection against negativity (therefore it was already used in Egyptian and Mayan temples) because everything that does not come in Truth cannot pass it.
If you do magick with more than one person, make sure that your shield covers all magicians and the complete working space! This time suits of armour are not suitable, but a circle of protection or the color cobalt blue for instance are very good ones. Before you start the magick agree on the shielding form.
After working magick it is advisable to again visualize a shield to keep astral beings at a distance who might have been attracted by your rituals.