I've had some experience overhauling pedals like those. First and foremost, some pedals are not made to be rebuilt, and you may destroy them getting them apart.
You may need to (carefully) clamp the pedal body and (carefully, again) use a punch and hammer on the axle to push out the "crank side" bearing and axle, then you can use a drift or punch to push the bearing out of the non-crank side, if there is one.
Something to remember, not all pedals use actual sealed bearings on both sides, some may use a DU sleeve bearing or bushing one side, and some may also use non-standard or hard-to-source needle bearings. If they are a "standard" bearing, it's entirely possible to rebuild. But what constitutes a standard bearing for your area and how involved you want to get is up to you.
If you got 30+ years of use out of those pedals as you say in the comments, it may be time to hang them up and get a shiny new set of LOOKs.