I've been using it for like 4 years. A Hint: Start with box. Use Extrude and bevel. The Mesh Smooth. THE BEST way to do it. I can make grunts and MasterChiefs with this. It's the bomb.
Do tutorials. Experiment with it. 3D is NOT, I repeat, NOT an easy thing to do. It takes an incredible amount of experience/skill to make a good model. Don't expect this to be easy by a long shot. And don't expect yourself to suddenly become a master at 3D. You need to practice at it.