First check whether your country's licence allows you to drive in the UK temporarily. It might do for up to a year. Use the time to get some lessons and practice.
Driving on the other side of the road isn't very difficult. People from the UK take their cars to continental Europe by ferry or the Eurotunnel all the time and you get used to it very quickly. I did.
What is probably harder to get used to is sitting on the right instead of the left and everything that goes with that, like having to use your left hand for the gears and the handbrake instead of your right hand. Find a good driving school that uses dual-control cars and tell them what your needs are - that you can already drive but you're used to driving on the right - and they can work with you. You might be surprised how soon you get used to it. I learned with BSM http://www.bsm.co.uk/ and they are NOT cheap but you certainly get what you pay for. They will take you out in a dual-control car for some nice easy practice in quiet roads to start with, then get you up to test standard as fast as you can go.
What dual control means is that the instructor also has a brake pedal. (And a clutch pedal if the car has a manual gearbox - the majority of British cars do and it's worth passing the test in one if you can. If you can drive a manual properly it saves petrol as compared with an automatic, and with the price of petrol in the UK, that's worth thinking about. If you pass the test in an automatic, you are only licensed to drive automatics.) Dual control means the instructor can slam on the brakes if you're going to hit something, and that frees you up not to worry about it. You can concentrate on learning. BSM tend to use cars with particularly nasty gearboxes and that's a good thing. They currently use the Vauxhall Corsa - I took a couple of refresher lessons in one after I hadn't been driving for a while. If you can change gears smoothly in one of those, you can drive ANYTHING!
The UK driving test comes in two parts, theory and practical, and you have to pass the theory first. The practical test is 45 minutes long on actual roads with a few set manoeuvres included for you to show the examiner how well you can control the car, and you will fail it if you do more than the slightest thing wrong. Most people pass it second time. If you fail it, the examiner gives you a form telling you exactly what they weren't happy with so you can focus on that for next time. With so many narrow roads in the UK, it's a good thing that the test is a stiff one.
Look at how many people are on the roads in their cars. They all passed. You can too!