In reply to Elia:
Traverse of the Gods is at Swanage, between Tilly Whim Caves and Subluminal, not on Portland. It is very long, about 15 pitches, and involves aid style techniques not used on most trad or sport routes. The full fat version also involves swimming across Black Zawn, certainly not to be recommended at this time of year.
Wait until Summer, when the water is warmer, and do some of the other similar style routes first such as 'Benny' at the Promenade for aid climbing and 'The Adventures of Portland Bill' for traverse experience at Swanage.
The photo here
http://ianparnellphotography.blogspot.co.uk/2008_06_01_archive.html might also give you an idea of what you may expect on the route.....
TJB.
Post edited at 06:30