Slight variation on Pieface's technique (many ways to skin a cat etc etc)
stop parallel with target car but slightly ahead.
tilt n/s wing mirror down so you can see the rear wheel & kerb (obviously leccy mirrors help here).
reverse till ends of cars are almost level, quick check in blindspot (so you dont swing out and take out passing STW rider commuting to/from work), one turn L.
when car is at 45 degrees (or half past one on clockface if easier to visualise), one turn back (R) so wheels straight.
back in using n/s mirror too check the closing gap between rear wheel & kerb, then another turn R when a good drain width from kerb. Tweak as necessary with more/less R lock using n/s mirror to judge.
look fwd, and just as coming parallel with kerb, one turn L to straighten wheels.
Just keep it sloooooow. Many people rush to finish quickly and it goes pete tong. Just make the impatient buggers wait while you get it right first time!!
Hope that helps.
Rob