Roundabouts have been a part of UK motoring for ages (1909 saw the first one built) and they are built as new roads are laid down. A recent innovation are mini roundabouts which, where conditions apply are just painted in the road. Sometimes they have a slightly domed centre.
Roundabouts on major and multi-lane roads usually have painted directions and fancy lane markings. An outward spiral. If you get in the marked lane to begin with you never need to move out of it to take the correct exit.
Drivers in the UK are brought up with roundabouts, so there should be no excuses!
What they have had to do, on busy roundabouts on main arterial roads, is install traffic lights. The drawback of roundabouts is they need similar traffic flow on each leg, otherwise some routes struggle to get a fair crack.