Embarrassingly

nearly 10 months after passing my GFT I am setting off on my first decent length cross-country trip with pax (my girlfriend). We're off from Redhill to Exeter for an overnight stay and then back.
Sooooo... I've got my Pooleys, I've spoken to Exeter about landing fees and overnight parking, I'll get my narrow route briefing for NOTAMs, I've got fingers crossed for the Wx, I'll do my flight planning and all that jazz, I've taken a bit of advice on getting crossing from our friends at Southampton (be heading East/West and West/East, right, to cross main runway and be polite?!) and I've got a load of frequencies and VORs written down for maximum communication/navigation coverage... oh, yes - and I've booked an aeroplane
I still can't help but feel slightly unprepared, though!
Do I have to file a flight plan? I don't think so, but...
Surely this stuff gets more instinctive the more you do it? Hope so...