I usually put the oil after shower at night and the cream in the morning. As for the oil, put some water onto your body to help spread the oil. I literally pour a small puddle of water in my hands and rub on my tummy and thigh, then very quickly, apply the oil. Oh, I do it in the bedroom.. though i think it'll be easier to do it in the bathroom (I stay with my in laws).
I do not wash it off until the morning, but if i remember correctly, the instruction does mention to wash it off after application if desired. =)