Hi Yuri,

I totally get it. My recommendations:

1)Read the actual manual of the program, command by command: http://moi3d.com/3.0/docs/moi_help.pdf
I know it seems tedious and we are all used to things being chewed for us, but it's by far the best way to understand the tool.

2) Chipp Walters vids on youtube were a great help for me.

3) (and probably most important) Keep modelling stuff in MoI and create your own shortcuts for the tools you use most. With time, you will start working around problems and develop strategies to approach shapes. You will start to expect what could be an issue and start to enjoy the process. By getting familiar with construction lines, the edit frame and snap modes you will get a very undisturbed and intuitive flow, almost like sketching.