Hello tait...
I like to turn off the lights in the tank first. Then, rinse the bag off under a little warm tap water. Ease the bag into the tank and open it. Every 5 minutes for about 30, put a tablespoon of the tank water into the bag. After 30 minutes, you can tip the bag and let the fish swim out. If a little of the bag water gets into the tank, it's nothing to fret over. You have a filtration system and a considerable amount of tank water to remove and dilute the contents of the bag that get into the tank.
I drop a little food into the tank and turn the lights back on. The fish are distracted by the food and don't pay much attention to the newcomer.
B