Round abouts

 What's with all the "round abouts"...We sure never head those when I had driver's ed. I  know you have to yield to the left..but the ones tha thave double lane ones just throw me.I'm never sure which part of the circle to enter--depending on where I want to exit the "circle from hell".
  And now some major streets have them so close together that  I fear I will either 1) end up going around in circles or 2) end up leaving the circle at an UNintended spot and go god knows where.  I have changed my routes through the city to avoid these areas..but I still find my self swearing under my breath when the car behind me is honking at me (when I am about to enter a single lane round about) as I assess the speed of the car directly across from me. . .which just entered the circle but is going so fast that they, essentially, ARE on my left.  Could someone make some "public service videos" for tv showing  some scenarios at round abouts?