I agree, it's all about having the time to practice. Which is the main reason I haven't taken my test yet!
When I was learning to drive as a teenager, I used to take every opportunity to drive and practice.
But now, we live in London, and even if I did want to drive around here, we hardly use our car. The only opportunity I get to drive is when we go to my in-laws for a weekend, which happens every 2 or 3 months. Sadly, I have had a lot of trouble building on my progress (learning manual for the first time) with such gaps in between my 'lessons' (with my husband). These weekends are also often taken up with other events, which leaves little time for driving.
I'm now at the point where I am seriously considering going on one of those 1 week intensive courses because I need to pass before I need to renew my provisional/re-take my theory test and pay anymore premiums for being on our insurance as a 'learner.'
Chrissy--I think your advice about treating your husband as your instructor is brilliant. It's not easy, but I think this is really key if you are using a friend/family member to teach you. I really need to keep working at this.