Im about 31% of the way there according to justgiving!, I started much earlier this time but it is hard work.
Work out what you need to raise each week and aim for those targets, it helps with the panic as you have a plan to work to.
There are some great ideas on the Phab site and of course on all the other charity sites too. Im going to try the Smarties tube full of pound coins with my friends kids, (they hold 41 pound coins apparently) !
Just ask anyone and everyone you meet to sponsor you.
It can be done you just have to live and breathe raising money for a few months!