How to replace rear wheel bearings - Newbie attempt

[[email protected]]

Hi,

I am trying to replace my rear wheel bearings but I am really not sure
how to do it! I took the axle out and I can see the bearings which
appear to just be loose - ie. not in a race.

Where can I get replacement bearings that are appropriate? Are they a
standard size and to replace them, do I just scrape the old ones out,
de-grease, put the new ones in and re-grease?

Thanks!
Matt

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