In cases like these, it's best to remember that the recommendations on packaging are usually for the maximum amount that would be necessary, so instead of doubling up on mousse if your hair is long, you should be halving it if it's short. When it comes to skin care, never use more than your skin can absorb quickly and easily. As little as possible is best, usually about as much as will fit on the tip of your index finger. If you didn't use enough, you can always put on a little more, but too much can clog your pores. Most importantly, though, you should be finding the amount that works for you, not what's on the package. So experiment — start out using much less than you think you need, and then work your way up until you get the results you want.