replacing the $5.00 gasket in the oil filter housing is a 2-4 hours job depending on you mechanical skill and tools available. hardest part is removing the fan clutch. You can buy the special tools necessary to remove the fan clutch or you can use a BFH to remove it. Video is available on Youtube for the fan clutch removal with a BFH and the replacement of the oil filter housing gasket.
replacing the the valve cover gasket is a 2-3 hours job again depending on your mechanical skills. No special tools are needed to perform this service.