I still cannot seem to get the hang of these yet.
I can see it, but only after I am informed as to what is there.
Just remember that the romans used the same letters as modern English, except that v=u and i=j. (for example augustus is spelled avgvstvs and julius is spelled iulius)
My best advice would be to look for the name of the emperor first, then try to narrow it down further with all the extra letters.