Okay, that's pretty simple. Just make sure that your tank and mod are at room temperature. Turn the mod off, remove the tank, empty the juice. Open up the tank and remove the old coil. Take the new coil and drip one or two drops of juice on to the cotton you can see through the inlet ports around the coil, this primes the coil. Install the coil, reassemble the tank and fill it. Install back on your mod and turn it on. No need to worry about the ohms, the mod will detect the resistance automatically. Adjust the wattage to the lowest setting that the coil is rated for and try it. From there adjust the wattage to your preference. Just make sure you don't exceed the max watts that the coil is rated for. Takes longer to tell about than it does to do.