First tanning product I've ever owned, tried it yesterday just on legs and feet went ok only a hint of colour want to try arms now but going out at weekend in strappy top so dont want any disasters, do I do both sides of arms? What about armpit area?if I do chest where do I stop so it blends with my face? How do I do hands and finally if it goes wrong can I scrub it off how long does it take to fade?