At Christmas I was given a book called Daily Painting, by Carol Marine. In it she describes how she decided to paint a small 6" x 6" panel every day, and in doing so, how her painting improved very quickly. I thought it was a great idea and so went off to a nearby hardware store and got them to cut me a pile of 6 x 6 mdf panels, which I then coated in gesso.
I've begun painting through this pile - not daily, as other things have crowded into life - but often. And it is very liberating. If it doesn´t work out then I've not wasted lots of time (I'm giving myself no more than an hour a panel), and yet with each painting I am having to work with composition, colour, tonal values and so on, so each one teaches ,me something.
So, can I encourage you to have a go. Get Carol's book for inspiration, or just start painting small, as often as you can.