how do you get confidence in driving ?
by driving , without time pressures , if you live somewhere where you can get to some reasonable country roads go and practice there - it;s what people do when they are doing prep for advanced and what the emergency services driver trainers do with middle of the course drivers ( when response techniques are introduced )
if you are struggling for confidence etc then pass plus or similar becomes an even better idea than it is for the 'ordinary' driver ( pass plus should have the biggest effect on the two extremes of drivers i.e. the nervous and the recklessly over confident )