If they really want to practice Vajrayana then they can

If I want to practice visualizing Buddha or a Yidam should I receive initiation from a Vajra master? I’ve heard visualizing without receiving initiation may create bad karma. If I want to visualize You, may You give us some ritual, ceremony this time?

Generally speaking, Vajrayana requires one to have got initiation, instructions, reading transmission for practicing a Deity or anything. So, the answer is “Yes”. But I think when people do not have good conditions to receive empowerment from a Vajra master, still they really want to practice and have got a lot of enthusiasm in practicing Vajrayana, I think they can practice. They can recite mantra, they can practice Yidam. But the best way is based on the conditions.

 Hungkar Dorje Rinpoche (Viet Nam – 2012)