LibreOffice - unlike Microsoft Word - does not offer to change the color of Arabic diacritical marks (tashkeel/harakat). However, there are two tricks.
Arabic keyboards lack many important special characters. Here is a list of the most important characters and signs which you can copy and paste.
Arabic is usually written without vowels (tashkeel). The website Forvo can help you to find the correct pronunciation of Arabic words and names.
The first frustrating experience of many Arabic students is usually the moment when the teacher turns Al-Jazeera or Al-Arabiya on.Most of the time, teachers have to pause after each sentence and ask which words were actually understood. But there is hope: a great audio option on al-Jazeera.
Arabic used to be written without dots in ancient times. At least it did, a long time ago. Could you read such sentences?