200k miles is about all a Honda Civic radiator is good for.
With the help of Corvette JT, there's a whole new one in there now.
We departed from the manual a bit by removing just the grill from the front rather than the entire front bumper skin.
Getting the stems for the transmission cooler and lower hose past the fan shrouds is fiddly and only goes with everything held just so.
If you ever have to do this, don't forget to grab the little rubber feet off the old radiator. You need those! When you do forget them, you have to blindly flail around inside the core support to find the stud they attach to with your helper holding the radiator up.