In my opinion the Docking training is difficult not only because the process is hard but also because the steps leave out important things (at least that's what I gather). Here's where I get stuck: I get the correct inclination and set up a rendevouz at about 3km separation. Then, if I remember correctly, you are told to burn retrograde until your speed drops below 50 m/s. Until this point everything works but then you are told to use your RCS thrusters to make your speed drop to zero. But it says to start this when separated from the target at about 10km. Problem is that once your speed drops below 50 m/s your orbits don't intersect anymore. Meaning you don't get any closer than you currently are. In my case we are always at least 43 km apart. So either the instructions are wrong or there are important steps missing. I started everything EXACTLY when and how I was told by the training text.