You should check if your radiator fan and itsswitch are working fine.
Never changed a radiator on a Honda but did it on a Ford and a Nissan no
problem. It is easier than several other things you have done.I didn't buy
new radiators with my old cars. I bought refurbished ones instead. And you
should change the thermostat at the same time since you're not sure.
You might also want to plus a garden hose into the system and rinse
everything clean since you'll be changing the coolant anyway. They sell an
adaptor that you can easily install on one of the hoses and plug a garden
hose to rinse the system.