NineEighteen
Don't be daunted, as an (as you put it) low hourer you need to keep practicing the planning, navigating and RT skills that you made such an effort to learn to get your licence or you will get rusty very quickly.
I did Shoreham - Compton as one of the legs of my QXC, including the transit over Southampton. If my instructor though I could do it then I'm sure any PPL should be able to do it.
PhilD