As per hindu scriptures,form of worship has been divided into three segments: Mantras, Yantras, Tantra.
“Its a constant chant of particular words to appease the almighty”. It has its own powers and are most ideal for humankind. With the help of a good “pandit” (a Brahman or sage), right “vidhi”(the process of doing a ritual) and right mantras you can achieve all that you desire.
Symbolic writing in various forms of metals. Use of yantras by activating its energies through regular course of chanting particular mantras is also suggested for our achievements.
Tantras is nothing but more powerful mantras. The right “vidhi” and right guide for the same is most important. One should avoid such practises, until intentions are clear and one is sure about the right guide and right vidhi. OTHERWISE IT CAN HARM THE WORSHIPPER ITSELF.