If you are starting out on Revit, there is something I try and teach all my students, clients and colleagues and that is to take it slow. It sounds obvious, but it is something you really need to remind yourself of each time you use Revit because trying to use the software quickly and skipping vital steps will only lead to problems & frustrations.
Revit requires a step by step approach. Sometimes you need to do things in a certain order for it to work properly. When starting out, read all the warning messages and strange dialog boxes, and make your way through menu's top to bottom to understand all your options available to you, don't just rush to the 'APPLY' button.
The speed will come, but your understanding of the software needs to come first. Give it 3 months, you will wonder how you ever got by on 2D CAD software.