I did a watercolour class for over a year, and did enjoy it, but it is a very unforgiving medium - my last art teacher said it is the hardest of all, because so often, if you make a mistake, you can't correct it.
I have a picture that I was really pleased with - I'd tried to paint this particular picture several times (it was a picture of ds2 looking across to Mull, on a beach on Iona), but it all went wrong at the last minute, and was completely irretrievable - I was sooo cross.
I now use acrylics and far prefer them - not just because I can paint over my mistakes, but because you can get lovely texture in acrylics, the colours are so vibrant, and also they dry fast so layering colours and textures is easier than with oilpaints.
Our current art teacher has got me to try sketching with the paint, rather than drawing everything meticulously beforehand, and it is actually coming out quite well - and I started with a yellow ochre wash too, which was also very helpful.
What sort of things are you painting, Curiousmama? I should be painting a picture of my mother's cat - she's asked me to do this for her as her birthday present, but I have only just over a month to go, and this cat is NOT going well (I was painting the cat before the new art teacher started, so the poor moggy, sadly - it's not the paint-sketched painting that is going well).