Before I even got my first Airsoft gun I watched about 15 hours of tutorials and tips on youtube, It helped me quite a bit. When I got my gun and had to change the spring, It was a whole different story. I lost the very small spring inside the gear box, Nearly cut one of the wires and broke my motor. What I am trying to say is: With out physical practice and actually doing it, You will find learning a lot more harder. Watch some videos But play around with your gear box, Make your self feel confident when Opening up your rifle, Because Without that, You will not get very far.
I wish you all the best in your mysterious journey inside the gear box, Best of luck friend!