What is the ruling on beginning to memorize the Qur’an while fearing falling into errors in diacritics and recitation, especially given the unavailability of someone to correct me?

Learning and memorizing the Qur’an are among the greatest acts of obedience, so beware of the whispers of Satan that would deprive you of them. Be diligent in ensuring the accuracy of what you memorize by listening to available audio recordings. If you cannot find someone to correct you, then strive, and there is no sin upon you for unintentional error, as the Prophet, peace and blessings be upon him, said: "Indeed, Allah has pardoned for my Ummah their mistakes, their forgetfulness, and what they are forced to do." Encourage your colleagues to memorize the Book of Allah and do not let the fear of making mistakes be an obstacle.