Step 1: Clean
Step 2: Protection
It is important to protect yourself, too! Wear gloves when handling the paint, along with a mask and glasses if possible. Change into clothes you do not care about so your nice outfits won't get soiled.
Step 3: Spray!!
Once dry to the touch, peel away all tape and trash bags. Be sure to wait 24 hours until you write on your chalkboard surface.
Step 4: Approximately 24 hours later...
For cleaning: Use a wet rag to completely get rid of chalk dust.