Great to hear! Can you tell me all the steps you have been/will be required to go through?
Also, what does provisional license mean exactly?
As for timing, be aware:
It takes a few weeks to get your provisional license sent to you when you apply for it. It can take longer if you have to disclose any medical conditions and they want to follow up with your GP/physician back in the US.
Once you have your provisional license, you can book the theory test. For me, there was a 10-week wait before a test slot was available for my theory test. Some test centers are busier than others.
You are encouraged to take driving lessons. Yes, we all know how to drive, and yes, it is easy to resent the instructor during lessons. But the lessons are meant to teach you how to pass the test, which is
not merely driving, and it is something you will want to know. I did three 2-hour lessons, and then paid to use my instructor's car on the day of the practical test. Allow time in your timeline for these lessons.
When you are ready, book your test. Similar to my theory test, I had to book my practical at least 6 weeks in advance. Allow for this in your timeline.
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Ideally, you would get started on these steps as soon as you have moved over and have proof of residence. Definitely get started by the six-month mark if you don't want to run the risk of becoming a "learner driver."