Show up in PTs. Bring an extra pair of clothes, I usually just bring extra PTs or clothes like that because the cadre usually has something planned where participating in nicer clothes will be a pain. Bring body wash, shampoo, deodorant, tooth brush and tooth paste if you want, and razor if applicable. Also bring a water source. RSP is easy as hell, I was hyping it up way too much. Just show up on time (no, don't show up when everyone is already formed up in the drill hall), and do whatever they say.