I have naurally mid brown hair and after months of dabbling with highlights, I plucked up the courage and finally went to the hair dresser and said 'make me blonde'.
However, my hairdresser said that to do it through highlights, which is what i have, it takes serval highlighting sessions, going progressively lighter each time before you get that all over blonde look.
Although I am an impatient person by nature and on initially hearing that, was quite downhearted, in hinesight, it's actually a good thing to do as you can get used to it as you go a bit lighter.
Unlike misjef, I have foils. The cap tends to lead to finer strands of colour but because of the cap, the hair dresser can't put the dye as near to the root of your hair as they can with foils which means you have to get them done more often as they grow out a bit sooner. And I tell my hairdresser I want a whole head of fine foils and he does it very well (or at least I think so...but then I would!)
As far as straightners go, I use a babylis pair although have never had GHD's and peope do wax lyrical about them...that said, I'm not prepared to spend �80 when a �30 pair do the job. And these particular ones are quite thin (although whether you could twist your hair round them I don't know - depends on the length of your hair. that said, you could twist your hair in your fingers several times and put that twisted bit between the plates of the straighters - mines too short to try that though so I don't know if it'd work.