One by one
One of the easy way to learn the orbiter is to learn each MFD's function, one by one, by seeing the playback or other tutorial. Remember, one by one, so IF you want to learn alignMFD for example, focus your mind only to how this MFD works when you watch a playback or read a tutorial. After you get the hang of it, continue to other MFD.
If you think "I want to go to (somewhere), which MFD should I use?" It may be too complicated for you because you are facing with multiple MFDs and their functions that you haven't understand (or understood? sorry for the grammar). You can memorize the steps from a playback or tutorial, but you will get small knowledge from it.
Oh yeah, if you confused about what button should be pressed when you want to do something with your vessel, try to memorize the stock Delta Glider control button (you can see from it's doc).
Be patient,
there is no shortcut for feeding your brain,
when the time comes the knowledge that you gather will bring pride for you while playing the Orbiter successfully.