I just did this a few weeks back on my 98 Passport.

There are 8 bolts to remove. 4 on the outer corners of the manifold and four on top of the manifold (toward the center of the engine). The two at the rear of the engine are a little bit tough to get to, but they are reachable. All either 12 or 14 mm I don't remember which right off.

You'll need a 22mm or 7/8" open end wrench to get the EGR tube loose from the bottom of the manifold. I didn't take anything else loose.

Once all of this is loose I just pryed my manifold up with a pry bar and used my free hand to get the gasket out. Did the same to re-install. It's really not bad at all. It would really help if you did have a helper to hold the manifold up and you can have both hands free to work the gasket into place.

Some have used bunjee cords to hold the manifold up out of the way, but I didn't need to.

Good luck,

Joe