The hardest thing that I always found on my xc's was that without fail some sneaky b*gger would come along after you depart and steal the airstrip.
Always remember on one of my solo navex's a radio call 'G-XXXX are you visual with the airfield?'; 'Negative, struggling to locate, can you assist'; 'Affirm, it is 1000 feet directly beneath you'.
Good luck, a big milestone.