If you're not a confident driver, as has been said before, you should get the bus.
A million times, yes.
I've had a bit of a shit day, so please do forgive the tanty.
There's a particular stretch of motorway near here, fairly straight with no major incline and three lanes. Guaranteed, there's some arse decides to drive along at 50 in the outside lane, refuses to pull in and gets all uppity because they're apparently triggered by moving at an acceptable speed on a major road. If you want to do 50 on a motorway or dual carriageway, do not drive in the outside fucking lane.
Then you get the sort on NSL A and B roads that seem to take the view that 50, regardless of whether there's a bend or it's fairly straight, is the limit. Usually the same sort that say "if you don't like it, you can overtake." That in and of itself can be easier said the done when there's heavy oncoming traffic.
Finally, you get the plain-old-fashioned nervous Nellies who seem to think that their lack of confidence means that they can inflict their nerves upon everyone else. They make excuses and get defensive about this, extremely and almost militantly so, because deep down that sense of inferiority rankles them but they refuse to accept that they should give up their license. Practice on an industrial estate after 5pm, take Pass Plus, get a friend to drive with you (or if it helps, don't). Those that complain that you have to suck it up seem less inclined to turn that self-same mirror on themselves, and just get a sodding move on when they get behind the wheel.