In reply to glenn0010:
I can remember climbing my first F7c and thinking, "I'll never fail on a VS (F4) again." (Had done many, many hundreds, if not thousands of VSs, by this point.)
Well, Lordy, Lordy, the very next week I failed on a VS. Who'd have thought it? Well, not me! Got a much needed dose of humility.
F4s can be tricky. A lot of understanding trickiness is just getting a feel for what different rock types can throw at you (e.g. quarried, versus natural limestone, slate versus sandstone).
Wander around different venues and don't worry about grades too much. You'll get a feel for things.
If you've been doing F6c+ in Malta and it's Stevie Haston who was doing the grading, I doubt they were overgraded!
Mick