Don't know if the things posted above are necessary or not (have never done it). But, in the service manual it says to raise the car as needed to gain access under it. Remove the splash shield, and remove the lower mount nut on each mount. Lower the car ( I guess if its sitting to high to to allow access to the top mount bolts). But if its doable in the raised position, remove the top nut from each mount. Jack the engine up to a point that will clear the upper stud from its mount bracket and pull them out.
They say to monitor the clearance between the engine and firewall while jacking. Nothing is mentioned about exhaust work action, then reverse the action after placing the new mounts in place. Course this info, is if the exhaust is still stock in this area.