Turn down map scroll speed and bind four map movement keys to easily accessible keys. I have WASD as map movement, 1234 as abilities, QE as summoners, and RFX as the first three item slots with C as stop moving/attacking. Everything is smartcast, and I also have self-cast 1234 with Control and level up spells with Shift. This way, I can move the map without interrupting my play, and pressing spacebar toggles the camera lock feature if I need to get back to myself after looking around the map or during crazy teamfights.
The only way to get used to something is to do it; there's no magic button that you can push to get better at something.