It really is important to have a teacher, properly qualifed and acknowledged by his/her own teacher i.e. part of the ancient lineage - bit like the apostolic succession but of course even older. Only the true teacher who manifests the love and compassionate action of ones true nature is able to remove all our barriers so that the great ocean of Buddhism and compassion may flow unhindered.
May you all encounter a true teacher.
Love and gassho, Genshin.