"Why can't I make this sound right?"

“Why does it sound different from how she is saying it?”

Or possibly frustrated that you don’t know how to change a consonant sound to be closer to what a native speaker says it. 

It is because consonants are produced differently in American English or the General American accent.

Some consonant sounds don't even exist in other languages.  

One way to look and analyze how to correctly make a consonant sound is by analyzing the place, manner, and voicing of a consonant. This is what professionals, such as me, utilize to analyze the difference of how a consonant is produced vs how a speaker is producing the sound. 

Place: This pertains to where the sound is produced.
Is it produced using both your lips?  Is the sound produced by placing your tongue behind your teeth, which is called the alveolar ridge (e.g., /t/). There are eight different categories.
 
Manner: This pertains to how the sound is produced.
Are you stopping the sound and then have a burst (e.g., /t, d, k, g)? There are six areas on how a sound is produced.

Voicing: This pertains to whether your voice is "on" or "off". This refers to whether you are using vocal folds or not to produce the sound. With voice sounds, your vocal folds are vibrating. Consonants are voiceless or voiced consonants.  You know you are using your voice when you place your hand on your throat and feel if it is vibrating.  Voiced consonant sounds include some of the following: /b, d, g, v, ð, z/.

Would I say it is necessary to know ALL details for all three areas to produce consonants correctly? 
 
I would say no, because it might get confusing and more information that you don’t necessarily need to know to learn a sound.
 
It is important to know place and manner (and voicing depending on the sound) of the sound you are focusing on. You can find out on your own, of course, but also can seek out the expertise of a professional or someone knowledgeable to only focus on information that is necessary to know and leave out anything that is unnecessary.

If you have already started accent training sessions, this way of analyzing sounds can be helpful troubleshooting between sessions as well.  If you just learned the sound and find that it still doesn’t sound close to the American English pronunciation, you can think where exactly the breakdown is and it discuss it with your accent instructor or coach.  For example, are you cutting off the sound too quickly making a "th" sound more like a /t,d/? Do you have your voice off instead of on? 
 
If you would like a more in-depth description and nitty gritty of each area, let me know in the comments.  
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 Have you ever heard of the place-manner-voicing analysis?  

One of the first things that people like to discuss when first meeting others is what they enjoy doing during their free time. It is a great way to determine any common interests. There are lots of hobbies that a person can have.  The list will include common hobbies, including outdoor activities that are popular here in the Pacific Northwest.  If you would like another short lesson on hobbies, I can create more. The hobbies that are included in the audio are the following:
1. Hiking
2. Swimming
3. Skiing
4. Snowboarding
5. Reading
6. Watching movies
7. Playing board games
8. Running
9. Watching sports
10. Listening to music
General tips:
1. Listen carefully and repeat after each word and phrases.
2. Imitate the sounds, rhythm, and stress patterns that you hear.  
3. Practice this list at least once a day for up to 7 days and note your progress.

What are your hobbies?