The nack is keeping your hands on the steering wheel but releasing slightly to feed it with steering. That way it's impossible to cross-over.
probably by the end of the year i hope, 4 hours so far, and apparently my clutch control is perfect. I do however cross my arms whilst steering. New minis have ridiculously light steering, and are quite wide.
If you are needing to cross your hands over when steering it's usually a sign of taking the corner too quickly.
Not being patronising or owt, just giving my personal experience.
P.S. I learnt to drive in a new Mini, and I never had a problem with steering.