jls1081, the passenger side is very easy to remove, I have not removed the driver's side but it should be just as easy. You have to remove the passenger's side first in order to remove the driver's side, you must also remove the driver's side wiper arm.
Go here to see how to remove the passenger's side cowl:
http://www.randgraphics.org/PT_Cruis..._filration.htm
To remove the wiper arm
1. Place the wiper arm/blades in the PARK position and turn ignition OFF.
2. Open hood.
3. Using a trim stick or equivalent, gently pry up on the wiper arm nut cap and remove.
4. Remove wiper arm retaining nut.
5. Remove the arm from the pivot using a rocking motion while the arm is in an over/centered position.
6. Clean metal splinters OFF the pivot shafts.
Once the arm is removed, remove the screws holding the cowl on and then remove the cowl.
To re-install wiper arm
Replace cowl.
Before installation activate wiper system to ensure the wiper module is in the PARK position. Position wiper arms so that the tip of the driver's blade and the middle of the passenger's blade is on the park line on the windshield.
1. Place the arm on the pivot while the arm is in an over/centered position.
2. Install the wiper arm retaining nut and torque to 21 N-m or 190 in./lbs.
3. Install the wiper arm nut cap.
4. Close hood.
5. Verify system operation.
More info located here:
http://www.ptdoityourself.net/pttechlib14.html#338
While you're at it you might as well install the cabin air filter.