How to Invocate Lord Siva's blessings

Recently i learnt about Athi Rudhram through mahesh sir. The detail goes like this

Everyone is well aware of the greatness of Sri Rudram, the verses in praise and salutation of Lord Parameswara alias Sri Rudran. Chanting of Sri Rudram, verses that form the central portion of Krishna Yajur vedam is considered very auspicious and effective in invoking the blessings of the Supreme Lord. Chanting Sri Rudram at a stretch eleven times over with one chapter of Chamakam every time in between is known as "One Rudra Ekadasini" (11 times). Repeating this Rudra ekadasini eleven times is called a "Laghu Rudram" (11 x 11 = 121 times). Repeating this Laghu Rudram eleven times is called "Maha Rudram" (11x11x11 = 1331 times). 121 members usually perform "Maha Rudram", each chanting eleven times. Repeating "Maha Rudram" eleven times is called "Athi Rudram". This is normally performed by 121 members chanting Sri Rudram eleven times everyday for eleven days continuously; i.e. Maha Rudram repeated for eleven full days. (11x11x11x11 = 14641 times)

The powers and benefit of such an enviable task of participating and performing an "Athi Rudram" is beyond verbal description and it would suffice to sum it up that in our life span one should be lucky to see and participate in a AthiRudram.