Revit structure and Architecture is the easiest way to make 3D buildings, forget about Autocad, In my experience I found Revit to be much more easier than AutoCAD, for example drawing a wall in AutoCAD needs 4 to 6 steps instead in Revit you will do it in one step, but AutoCAD is much easier in tiny details where Revit will waste a lot of time to do so.
My advice is focus in doing mosques, church, and project which has a lot of decorations, because these decoration are the key of success in Revit. 
My advice for fresher in Revit, please focus in project which seems hard to you, project when you see or imagine it you say to your self: I'm not sure I can do it, this is what happened with me. Never give up ask people ask Autodesk community,
We (Revit Modelers) will change the meaning of drawing and we will make people understand what is BIM and how it can make our life easier....