That's how I started with my first insurance when I passed my test too, but if you tried that now, you'd be in the doodoo big time. My children are either new drivers or about to be new drivers. There are legitimate ways to ensure they don't get stung by insurers.
1, They take out a learners insurance policy on a car. Make sure they take a year to get their license, then they start with 1 years no claims (provided no accidents), builds confidence and experience.
2, Don't convert that learner policy into a full policy (the day my daughter passed her test, her current insurer offered her a discounted policy to drive her mum's Polo. Went from around £200 to £4500. NO THANK YOU. Shopped around £2,200 was the best offer.
3, Buy a car that isn't popular with other new drivers. VW Polo is very popular, and insurance companies know this. Shopped around and she bought a VW New Beetle Cabrio (not popular with youngsters) Insurance (with 1 years no claims) half the price of having her own policy on her mum's Polo. Beetle has a bigger engine, and more power, but is cheaper to insure.
4, As others have mentioned, there is a sweet spot on when to look at new policies, or renewals. It's around 21 days. We found the car, paid a deposit, and arranged final payment and collection 3 weeks later.
5, Blackbox is pretty much mandatory for new drivers unless you want to pay at least double.
6, Use comparision sites (more than one) as you may find a better deal than just with a meerkat or opera singer. USwitch worked out best for her.
7, Play with the voluntary excess, again there is a sweetspot. Too litlle makes it more expensive, too much also makes it more expensive. Back button in browser is very helpful for this.
The other recommendation I have is for anyone you know learning to drive, rather than take their test in their examiners car, take the test in their own car. Not only should they be more comfortable and at ease with it, it won't have dual controls. Examiners will then select easier route as a result of the lack of dual controls.
Finally, driving safely with blackbox means her renewal couldn't be bettered by shopping around, and is less than half the price of last year. Also got to ditch the blackbox. She just needs to keep up the good driving and not be silly.