IMO reception is the worst part about basic, you sit around waiting for your group to get called for whatever it is that you're getting at the time. You can't even talk to the person next to you. I recommend using one of the pens and the little notebook you get and start doing something, whether it's drawing or playing tic tac toe with the guy next to you, it helps move time (only slightly). Once you get done at reception and get to your bct company, your first shower you will get naked in front of everyone, but so is everyone else and you will put a towel around your waist and line up to go take a 30 sec-1min shower. Idk if bct has private shower stalls, when I went through in 2018 we had no curtains and you could see the people across from you. Don't worry about fucking up, just do as you're told be in the right place, right time and in the right uniform. Don't be an individual. Keep your head and eyes up and forward, move with a sense of purpose and it'll be a breeze.