It seems like it should be easy, but the more things change, the harder they seem to get. Fortunately, there are some really good experts out there that are more than willing to give you a hand. Martin Shervington is one them.
On his Plus Your Business site he’s got a great tutorial telling you how to Connect Your Google account to YouTube.
If ever there was one area that spins most heads, it is working through all the permutations relating to linking Google+ and YouTube accounts.