Those who cannot do this because it is difficult, can chant the Mantra Om Namah Sivaya , the Panchakshara Mantra of Lord Siva with Om preceding it. This armour will protect you from danger of every kind. It will protect you and also all those whom you want to be protected. It will protect your family, will protect your country, will protect the whole world. It can cease wars and tensions of every kind, provided you offer the prayers wholeheartedly from the bottom of your heart.
Collective prayer is very effective.
If a hundred persons join together and pray, it will have a greater effect than one person praying. Of course, if that single person is very powerful, even one person s prayer is alright. But, where personalities have their own weaknesses and foibles, it is better that people have congregational prayer. When all the minds are put together they form a great energy. It surges forth into God.