What to keep in mind, is to try to different techniques, until you find something that works for you. The key is to be mindful about what is working and what doesnt. What works for me may not work for someone else.
So the key is, to try, and if you dont see improvement right away, try something else.
I have found that when I try something different to improve a particular technique, I see improvement within one day, and if not one day, then at least within a week.
I use Hanon, Czerny, everything I get my hands on.
I find it funny when people argue, "THIS IS RIGHT, THIS IS WRONG!" There is no such thing. Usually people with such definite positions, they usually invested in someway, (like maybe they wasted a ton of time and dont want to admit it, or they want you to struggle the way THEY did), etc.