I always look for spherical bumps on opposing sides of the snake in the 2/3 - 3/4 the length of her body. Let her move against you, for instance, I just head my girls back into their tubs when I palp and they are generally pretty easy to do. Don't be afraid to squeeze, it won't hurt them and will be the only way to feel the follicles and just a little tip, use a snake bag or pillow case over your squeeze hand to reduce friction and it will be 100x easier to find what you're looking for.