Here's how I installed an SSD in my MacBook Pro. One downside to using a laptop is that you only have one hard drive slot, so upgrading to a super-fast SSD is often either expensive or space limiting.

The simpler option is to back up your Mac’s old hard drive to an external drive using Time Machine, then restore the backup to the new SSD. Follow the directions here.

First, you will need an OWC Aura Pro Express SSD drive, your MacBook Air, an external USB 2.0 backup drive, and pentalobe and T5 torx drivers (included with the Aura Pro Express).