Prep work: This will depend on the pool's condition. You may have problems later if you don't do the prep work correctly.
Plaster is most commonly used for concrete pools. There are other options available, like exposed aggregate. Let's explore your options.
If your pool doesn't have lighting, it may be difficult for you to use the pool at night. For around $900, subsurface lighting can be installed as long you have electrical connections to your pool. Upgrades include dimmable lights or color-changing lamps.