Sri Gurubhyon Namaha
For any mantra to be sucessful, the source from where it has come should be good, i mean a competent guru would be able to guide you , this is not to discourage you, but to let you know that any form of Shakti sadhana needs to have a competent guru who needs to give the diksha, and why should you be interested in siddhi of the mantra, the aim should be to attain oneness with the supreme parabrahman, holy mother, siddhis just tend to deviate you away from the final path, if at all you were to get siddhis, my sincire advise is to give them away through proper vedic process
Sri Kamakshi