For learning Tibetan language it is necessary to know alphabets in Tibetan. You have to know alphabets in Tibetan to learn writing in Tibetan language. Tibetan alphabets are the building blocks of Tibetan language. There are 35 characters in Tibetan alphabets. Tibetan alphabets are made up of Tibetan vowels and Tibetan consonants. The Tibetan alphabets contain 5 vowels and 30 consonants. Tibetan vs German gives a comparison between Tibetan and German alphabets.
Tibetan script is also known as Tibetan writing system or Tibetan orthography. The set of visible signs used to represent units of Tibetan language in a systematic way is called Tibetan Script. The Tibetan language uses Tibetan alphabet, Tibetan Braille i.e. Tibetan alphabets are derived from Tibetan alphabet, Tibetan Braille script. The script decides the writing direction of the any language, hence the writing direction of Tibetan is Left-To-Right, Horizontal. Learn Tibetan Greetings where you will find some interesting phrases.
Is Tibetan hard to learn? The answer to this question is that it depends on one's native language. One should start learning Tibetan language with Tibetan alphabets and Tibetan phonology.
Time taken to learn any language that is mentioned here is the approximate time required to learn specific language for the person who is proficient in English. You can also go through all Indian Languages and find if Tibetan is one of the language of India.