If you have that much patience all you need is a digging fork. Start now in a corner and keep going bit by bit right through until next spring!
Seriously though I'm sure you would enjoy it if you start growing asap as others have said. Digging is the best method of removing the weeds and roots plus its free and you prepare the soil for your crops. Other threads are talking about crops to plant at this time of year and it wouldn't take too long to clear an area for some onions and brassicas. Remember you don't need to clear the whole plot just enough for each crops needs.
Personally I'd also consider using gylphosate a few weeks before digging as it will help you a lot.