When we bought our tractor an old ransomes 2 furrow plough came with it as part of the deal. I know absolutely nothing about ploughing. I have no idea how to properly set up a plough and I'd never ploughed before. Nevertheless I stuck the plough on the back of the tractor and gave it a go. It worked fine. Probably wouldn't have won any prizes but the land got ploughed and nobody was killed or injured. Old hands would probably say I've done all sorts of things wrong but it doesn't matter.
Absolutely
We have a single furrow non-reversible plough but I wouldn't want to plough a couple of acres with it. We use it for small areas of not bigger than 1/4 acre. Turn one furrow, reverse back and do the next and so on - very tedious but fine for small areas. Make sure you turn the sod right over so the grass will die off, none left on the surface.
Ploughing is one thing for which we would still ask a neighbour for help (paid) if we had a couple of acres to do, as they have a big 6 furrow plough and could whizz through it in a very short time, and do it well.
The other thing you can do instead of ploughing up the whole thing is to disc harrow it or similar (something to cut through the grass roots) then handspread a seed mix. We did this on 2 and a bit acres and it has made it wonderful, with plenty of clover and more palateable grasses, without ever having to take the sheep off.