Most common way is to use a 17mm stubby wrench. Some are strong enough to use just the wrench, others use a pry bar on the wrench against something solid. I am not strong enough to do this so whenever I can I try to use a socket and breaker bar.

You won't be able to get a socket thru the gap in the manifold. I put the socket on the bolt from below and dropped a 1/4" extension down to it. You need a 1/4" extension, a 3/8" won't fit.