Consonant pronunciation for Sindarin is largely the same as it is in English (and Quenya). There are a few common rules to keep in mind though. Learn the exceptions by practicing them in a variety of Elvish words to internalize them. Like Quenya, the "c" and "k" sound are always hard and sound identical. The "r" is always rolled as well, like a Spanish speaker saying "correo." "Dh" and "wh" are usually pronounced like "th" in English. So a word like "bedhyr" is pronounced "beth-earr." "V" is silent when it's at the end of the word. "G" is always a hard "g," like in "hang." It is never pronounced softly or like a "j." The vowel pronunciation is near-identical to Quenya with the exception of the letter "y." This is treated as a vowel in Sindarin, but a consonant in Quenya. If a word in Sindarin has 3 syllables or fewer, emphasize the first syllable regardless of what letters are at the beginning of the word. This gives Sindarin a front-loaded sound, comparable to speakers of Portuguese, Welsh, or Gaelic. Take the famous character Legolas, for example. The first syllable in his name is pronounced loudly and sharply; it sounds like an American English speaker saying "leg." The "o" and "las" are soft, and make the rest of the word sound vaguely Spanish or Italian. Sindarin is the more commonly-spoken version of Elvish in Middle Earth. When you hear Elves speak in the Lord of the Rings films, pay attention to the way the characters speak and look out for these stresses. This rule is pretty straightforwardonly stress the third syllable in a word if there are 4 or more syllables in the word. Every other word is pronounced with the emphasis on the first syllable. For example, "Sindarin" is pronounced "SEEN-dar-in," not "sin-DAR-in." If there were a fourth syllable on the end of the word, it might become "sin-dar-IN-oh." In Quenya, "Sindarin" would be pronounced "seen-dair-IN." Irish and Scottish speakers tend to speak English by emphasizing sounds in the front of a word regardless of the standard pronunciation. This is a pretty good method for pronouncing Sindarin words, since the vast majority of them stress the first syllable. Speak Sindarin with an Irish or Scottish accent to pull off a basic Sindarin pronunciation. For example, an Irish or Scottish accent would pronounce "ai" (which means "hail") as "eye" instead of "aye," which is pretty close to the proper pronunciation in Sindarin.
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One-sentence summary -- Keep the English pronunciation of consonants with a few exceptions. Stress the first syllable when pronouncing most words in Sindarin. Emphasize the third syllable if the word has more than 3 syllables. Speak with an Irish or Scottish accent to pull off a natural Sindarin accent.

Children throw tantrums when they want something and do not get it. By acting out, the child may hope to get what they want in the end. If you give the child what they want (e.g. ice cream, or a delayed bathtime/bedtime), then the child will learn that tantrums are a good way to get things. It is much easier to start addressing tantrums when the autistic person is a child. For example, a 6-year-old boy who throws himself on the floor is much easier to manage compared to a 16-year-old. Also, the child will be less likely to cause injury to themself or others. Planned ignoring can work best for yelling, swearing, and sulking. This will teach the child that the behavior is not an effective way to get attention. It helps to clearly communicate this idea, such as "I can't understand what's wrong if you're pouting back there. But if you would like to calm down a little and explain what is wrong, I would be happy to listen to you." Always step in if the child begins throwing things, taking things that belong to others, or hitting. Ask the child to stop and then explain why the behavior is not okay. Tell your child that they can choose to act in a way that will get the desired response. Explaining this to your child will help your child understand the best way to get what they want (or at least a listening ear or a compromise). For example, you can tell your child, "If you'd like me to help you, you can take a few deep breaths and tell me what's wrong. I'm here for you if you need me."
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One-sentence summary --
Consider how your actions can affect your child's tantrums. Address tantrum behavior early. Ignore tantrum behavior. Intervene if the child is being mean or doing dangerous things. Invite your child to behave better.