B.O.B-lightbulb moment

I was having issues with function composition when f(x) and g(x) are both fractions with polynomials in their denominators. I kept winding up with a big confusing fraction over another fraction and getting the domains for those was driving me crazy. Then on Friday I remembered how to simplify those fractions-a little something I learned in Algebra 2 last year, and boom, I got it. Now I'm not having issues with it. And that's a pretty good feeling.
Kristin R