Since you can't check if the studs are without splits and more you'll want to rip off the drywall, double up the studs, drywall, paint and then it's ready.
I just bought a 50" plasma and I wanted to purchase the swing arm mount but was told that I would need to make sure my studs were reinforced that the 2x4 studs would not hold the weight of the TV. Is this necessary? And dose anyone have experience just using 2x4?
And can anyone recommend a swinging arm mount?