the reason for wasd is actually quite simple
a long time ago, games used to use arrow keys (movement in the right hand and most other controls in the left)
then the mouse became a primary form of visual control due to its precise analog control, it simply works better for controlling a camera then any other method ive ever found, however the most mice are primarily right handed, meaning the controls for movement needed to be shifted over to the left hand, wasd was chosen simply because its near every other left handed control key, and on the far left of the keyboard where it would be easy to reach
hand placement is easy once you get used to it (it was a pain to unlearn arrows for years for me), try formulating the placement based on the unique size and shapes of the keys around it, the A key is just to the right of the caps-lock key, the caps-lock is the just a fraction larger then the tab key, and in the middle of the keyboard, find tab, move right 1, you have your placement, all this is done in micro seconds after you get used to it, and you don't even think about it
glowing keys or light up keyboards can help, however, try ambient light, take a desk lamp, and face it toward a nearby wall, the resulting reflected light will be dim enough to be comfortable but bright enough to see your keys
on-top of all this, don't forget, you can almost always also use a game-pad, if your more comfortable with that