Hi Robert
I don't think it would be that much more difficult and you would be out with cars of similar performance . An F3 car is probably harder to drive on the absolute limit in order to win but not to just compete. Presumably you are still a novice driver so I would say it's better to be out there getting experience than spending a lot of money to be out next year or later in a maybe more competitive class. I have a friend who competes with a F3 in the juniors as his is an early F3 and not competitive in European F3, but has no problems with the car being more difficult to drive.
Duncans email is :
rabagliati@blueyonder.co.uk