congrats! After switching a year and half ago i've tried to ride without them a few times and it is like night and day. I can't imagine riding without them. you will love the use of those accessory muscles.

Welcome to the club

remember that the cleat should be under the ball of your foot (the base behind your toes and in front of your arch) and that you can angle the cleat.
The benefit of turning the cleat off of center is that it can make it much easier to clip out. You don't need to turn your heel out as far to get it to eject.