I think for a newly qualified PPL 'hard' is what you're not used to. I trained at Biggin and have found flying into air/ground airfields quite daunting. In reality it wasn't that challenging but when you've read umpteen threads about people being cut up on final by some non-radio microlight it begins to affect your perception. If you've trained at an a/g field then I'd suggest somewhere with full atc - Manston for instance (big runway, relatively quiet, hard to miss). If you've trained with atc then maybe Headcorn (follow the railway line from Tonbridge and use your DMe if you aren't confident of spotting it) which is a lovely place to go for a few hours. I'm at a similar stage myself and have found this thread very interesting indeed - thanks for asking!