87 454 exhaust manifold removal questions

[Jim85IROC]

I may need to remove the passenger side exhaust manifold on my pickup (87 GMC 3500 454). I've got an extremely irritating exhaust leak on the passenger side somewhere, and after spending 2 days replacing the donut seal on the exhaust manifold collector, I've discovered that it wasn't the problem. Either the manifold is cracked or the gasket is in need of replacement. Either way, it looks like the manifold will have to come off.

What kind of a nightmare am I looking at? The truck's got about 100k miles, and is a winter-driven vehicle. I would really like to get this thing off without destroying the air lines or breaking any bolts off in the head. Any pointers would be much appreciated.