fietsbob

I see sealed bearings, you can remove the seals, then clean and re grease the bearings ..
in situ ..

I would do that, in the case you describe, as you just want to service them.

For sealed bearing removal a tool is made to snap open behind the bearing,
then from the opposite side a drift punch can bang out the bearing, after removing the axle..

Don't have those tools?, consider turning the job over to your LBS ..