This may seem like a silly question to all you airgunners out there! my nephiew has just bought his first air rifle a smk co2 not sure of the model number xs79? However i have zeroed his scope in for him and he has now bought a gun light and laser to mout no to the scope, is zeroing the laser as siple as just looking through the scope and putting the dot in the crosshairs scope is zerod to 25yds, i have never used a laser sight so know nothing about them, it has 2 small allen screws for adjustment can it really be that simple or are there any other things to take into account?