Hi Renita, here's a Hometalk blogger and how she painted hers! https://www.hometalk.com/4242640/painted-brick-fireplace-white-redo
Fuzzy roller and a brush. Prime first.
Consider whitewash? Really easy and the price is RIGHT. I whitewashed my huge monster wall a couple years ago, amazing transformation. I posted it here on Hometalk ? "massive brick fireplace wall whitewash success"
Here's a sneak peek
This may help https://www.sherwin-williams.com/homeowners/inspiration/project-center/how-to-paint-a-fireplace
I just used craft acrylic paint. Look at the label some will say for brick, or porous. I just wanted to lighten the grout. I also did this to my sisters brick fire place too. Started with the grout only, but she wanted it white washed. So ended painting the whole thing