How long does it take to be comfortable driving?

I have a driver's license that I got 3 years ago, but to be honest it was pure luck that I passed my practical test! The examiner probably felt sorry for me and let me through even though I was definitely not confident enough.

Anyway, long story short, I was counting on my parents to teach me properly, but I had to move away for university that summer so there went that plan. This year my friends and I want to rent a car and drive around Europe traveling. I would like to take lessons until then (we'll be going in august) and possibly drive the car. Do you think this is reasonable?

Will it be safe to drive after say 20 lessons? I know this is a very generic question, but just share your experience and opinion. How long did it take you to be comfortable driving a car for example?

I definitely feel more confident now that I'm older ( I was 18 when I got my license), but I haven't had much experience. Drove my parent's car a few times, but I had someone with me in the car all the time. I also drove a scooter and I picked it up quite quickly if that counts. Was very comfortable driving that last year on holiday.
How long does it take to be comfortable driving?
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