Comb your hair well to get rid of any tangles. Pull your hair backwards, gathering it into a loose ponytail. If you want to create a lower messy bun, you can start the ponytail at the nape of your neck. But if you want your bun higher, make a high ponytail.Tie your ponytail with an elastic band and smooth out the bumps with a brush and gently pull up the pony, to create fullness on the top of your head. You can add some hairspray in order to make your hair easier to work with.
Wrap your hair around the base of your ponytail until it starts to coil around on itself and forms a loose bun on top of your head. You can either fix your messy bum with bobby pins or with a second elastic band.
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Using pins: Pin the edges of the bun. The pin should go in the roll and the hair underneath. Slide the pins into the roll and catch the hair with the longer tip. Rotate the pin and insert it to fix the bun. Drag the tips of the pin to touch your scalp. Be careful, not to hurt your scalp!You can divide your hair into two or three sections, twist and pin each section, one after another.
Another option is to use a second elastic band to secure the hair that was twisted and wrapped around the base of the ponytail. Tuck some bobby pins into the sides of the bun, to bring it closer to your head and to secure it.
As a final step, pull out loose, thin strands of hair around your neck, using your fingers. This way you bun will look semi effortless.
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if that's a bit confusing because i know it may be, try this http://www.youtube.com/watch?v=cIuqRzxD0sg, i found it helpful, or you can work with this idea as a base and do your own thing