I actually don't think that driving lessons would help you. The cheapest trick is just to just do it. Thousands and thousands of drivers cross either the tunnel connecting the UK and France or the different ferries, daily. In both directions it seems to work out just fine. They only need to temporarly adjust their lamps.
In some countries with neighboring countries driving on opposite sides (e.g. UK/France, Suriname/French-Guyana) there will be signs reminding you on what side to drive, at least on the primary roads driving away from the border.
The trick is to drive carefully and just follow the traffic and you will be fine. Problems arise when you are alone. At least with me especially on secluded scottish roads, it happened more then once that I ended up on the right side of the road, but still, when with enough caution I was always in time to correct.
I also don't drink at all when I am driving in the UK, although the UK isn't as strict in the amount of alcohol allowed as in other parts of Europe (0.08% vs 0.05%-0.02%).
With respect to the steering wheel or the pedals, those are the same no matter where you drive. In the beginning you might end up switching gear in the door or starting the windscreen wipers when changing lanes, but that is only sort of funny.
The main advice is:
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