Hi,
If you've not already done so I'd recommend coming along and watching this year rather than entering; you need to know what it is your committing yourself to doing.
If your really going to do this this year then look for a club in your area that has a good number of people who enter and go along and talk to them. if you're anywhere near Stourbridge in the West Midlands then the club I'm a member of,
http://www.stourbridgecyclingclub.com/, has a reasonable number of members, including women, who enter this.
Good luck,
Jackson