EW educational series videos are a great reference to keep on hand. What I have told people for a couple of years now is to count everything. When you think you got it, count it again. I've even counted world population graphs (btw, world population is in a bubble... Expect a crash ) Practice is key! Start yourself a thread to post your progress and charts. I'd be happy to critique your work as I'm sure others would too. (pro tip: make it self-moderated to keep the trolls out) It gets easier to understand and becomes second nature. Just keep at it.
Check my thread for some info on the psychology and some useful tools.