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@rodabod
Read Sheldon Brown's website first.
Be careful that the "CH" isn't short for Swiss. It probably isn't.
You want a c-spanner which is built into the side of any shitty pressed-steel multi tool like you get in a Poundland puncture repair kit. Or use a large blade screwdriver.
You don't generally need a pin spanner to adjust the adjustable cup; just use your hand to adjust it assuming it hasn't seized. Or a pair of needle-nosed pliers which you don't care about.
Strip, and bung in a load of your favourite grease. If the bearings look scuffed, then replace.
Don't bother removing the drive side cup unless you want to swap out the whole unit.