I use the drip method. Float him/her in the closed bag for 20 minutes to get used to the temp. Then pour the fish with its bag water into a bucket. Drip for 30 minutes. Scoop out half the water volume, and then drip for another 30 minutes. Scoop the fish out with your hand or the net, and introduce it to your tank.
Depending on where you ordered the fish from, it will probably come with acclimation instructions. If so, I would probably follow those instructions.
Happy acclimating! Congrats on your new fish!