Why do you want to practice perfectly?
I try to approach to spirituality
in a responsible manner ;p
If I decided to practice
I want to do it properly or not at all
I do not want to waste time to practice which do not bring results.
Ok, you are not fully aware of your own findings. In OP you described suffering and it's causes. Let me show you.
1. There is sorrow and anger
2. It is caused by lack of self confidence
3. Which happens when you are lost inside
4. Which is a result of not having everything at point
5. This expectation is driven by desire to be perfect
6. When you think it isn't.
Your expectations (actually all expectations) create suffering. That is why I post Buddhas words explaining that even desire for holy-life creates suffering.
This desire is like your boss who is never satisfied with the results. This way you will never stop giving more and more. He is not interested in you happiness, quite contrary. Suffering is a stimuli for you. Thankfully, suffering is also a seed of Buddhahood, because it makes you look for way out of this stressful life. And you are doing precisely that. Just pay attention to what you wrote in your first post, and draw conclusion.