Long ago,children used to go to gurukool to learn scriptures under a Guru.Nowadays,since the options are very limited I was wondering if we can learn the Vedas o our own.
You are asking about Swa-Adhyayana or Swadhyaya of vedas without a Guru.
Vedic / Upanishadic knowledge is symbolic and difficult to understand. Especially, the ritual part described in Brihadaranyaka and Chandogya Upanishads ( ritual symbolism) . Unless one know the technical and practical aspects of the rituals and their significance, one will not understand their symbolism or true meaning.
The vedas teach us about the Brahman - the highest Universal Principle or the Ultimate Truth .One also cannot learn about the Ultimate Truth from the Scriptures through personal reading and self-interpretation — the teaching must come from an Authority.The vedas have to be learnt /understood by heart, learning the correct way of pronouncing the mantras by listening to the mantras chanted by the guru (teacher). And the correct meaning should be grasped only through Guru. Originally Vedas are never written down and read. They are supposed to have been passed through oral tradition . Veda Adhyayana implied hearing from the lips of the teacher and repeating after him.
That is why Shree Krishna in Bhagavad Gita 4.34 is telling us to get the knowledge from a qualified guru.And such a knowledge is only becomes effective.
तद्विद्धि प्रणिपातेन परिप्रश्नेन सेवया।
उपदेक्ष्यन्ति ते ज्ञानं ज्ञानिनस्तत्त्वदर्शिनः।।4.34।।
tad viddhi praṇipātena paripraśnena sevayā
upadekṣyanti te jñānaṁ jñāninas tattva-darśinaḥ
Just try to learn the truth by approaching a spiritual master. Inquire from him submissively and render service unto him. The self-realized souls can impart knowledge unto you because they have seen the truth.
English Translation Of Sri Shankaracharya's Sanskrit Commentary By Swami Gambirananda
The considered view of the Lord is that Knowledge imparted by those who have full enlightenment becomes effective, not any other.
Therefore its highly recommended to learn vedas from qualified guru who knows the secrets of Vedas ,only By a qualified person ( Dvija) having completed the Upanayana samskara.