Some professions are very much about knowledge and the ability to exercise that knowledge, others are more about skill.
Music is very much about skill, and the thing with skills is that they take a long time to develop. With the exception of people with a natural aptitude, it takes a lot of time and patience -- there is just no way around it.
So what can you do to combat this sort of frustration:
- Above all, be patient.
- Work on the techniques in isolation. Find or invent exercises that target each of these techniques individually and start slow. Then maybe combine ones when you get good at them
- Practice each one a little each day, don't get stuck on one.
- Understand, that some days, 'It just ain't gonna happen'. Also, other days will be better -- it goes back and forth. If it isn't happening, don't force it, breath, practice it a little bit slowly and move on.
- Use mental practice, it is easier to do things if you can visualize what they look like, and also "visualize" how they feel and sound.
- Take lots of breaks when you practice these techniques.
- Focus on being relaxed while you practice. Maybe re-evaluate your caffeine intake if you find yourself raging.
Eventually, with good practice, and good teachers, these techniques will come. It will probably take you years -- enjoy the journey and don't force it.