I know some visualization techniques in order to strenghten your aura and creating shields around you, but I have this doubt: You can visualize around you light shields, etc but how long these light walls last? It is enough one visualization for maintaining and keeping the shield working one day, or does it last more time? I don´t know how many times each day/week you have to do the visualization exercises in order to keep those shields working.
I wouldn’t personally bank my protection on just visualization.
Learn the basics of energy manipulation and constructs, create a shield doing such as shields are basically just that constructs with programming, different layers doing different things or a unified construct shield with multiple programming.
this is how some psions make their shields, somewhat myself as well.