if it has a `u`type clamp then these are usually seized/tight to remove and may require a hack saw/grinder to remove,once off the exhaust flanges are usually seized also and usually need heat to free off but can also cut with a hacksaw the outer part of the flange and get the joint moving,very rarely exhausts fall apart as easily as you are suggesting
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.