There isn't much of Vidhi Vidhaan for practicing this Mantra. All you need to do is use an energised Tulsi Mala and chant this Shri Ram Mantra as much as possible every day. This is especially effective for people who cannot chant Hare Krishna Hare Rama Mantra due to the humongous chanting requirement of 3 crore 50 lakh Mantra Chants.
Indeed this Kali Yuga is in a very very bad state and especially for people who have passed their 40s and 50s and who want to go to Brahma Lok. I suggest to all these spiritually inclined people to chant this Ram Mantra as much as you can every day.
Moksha is attained when all the three Mantras are Siddh by the Sadhak as early as possible.
To attain Mantra Siddhi the Sadhak has to recite each Mantra 10 lakh times.
||ॐ श्री रामाय नमः
ॐ रामभद्राय नमः
ॐ रामचंद्राय नमः ||
|| Om Shri Ramaya Namah
Om Rambhadraya Namah
Om Ramchandraya Namah ||