PRACTICE HOW YOU WILL CARRY! Practice WITH what you will carry. I understand that mechanics and any practice is beneficial, but get as much range time in with your carry weapon as possible. In addition while I know carry ammo is expensive, plan to put several magazines through your carry sidearm with the self defense ammo. It is (at least mine is) a stouter load and feels different. You don't want the first time it feels different to be when you are running on adrenalin and it causes you to freeze. Worse yet, you want to be sure it will run reliably through your gun.
I am almost positive there is "A Girl And A Gun" club chapter up there. Google them. Crossfire is a great instructor, that is a fabulous idea.
You are absolutely right, it is a HUGE responsibility, and your mind set is great! Keep up the good work, seeking training, running scenarios in your head, and practice, practice practice!
I would also recommend a few "good" reads. A Cornered Cat (also a website & blog) by Kathy Jackson; The Gift of Fear by Gavin deBecker; Facing Violence by Rory Miller.
Blessings in your journey! and WELCOME!!