When installing, do not stand in a puddle of water. And do wear rubber flip-flops.
Joking aside this task should not be too difficult. Sure, be certain no energized wires in fixture.
First remove old thing and take a look at situation. How to support new thing may be a question. Since new thing is probably very light weight current attachment may be OK but some kind of new ceiling grip may be needed.
Once new fixture attached securely, hook proper wires together using twisters, or as i prefer, small connectors with screw tighteners..
https://www.kooltech.co.uk/air-condi...-30-amp-pp2445
Plz see photo of row of white connectors with two little screw heads, not any other color.
available at most HK hardware shops. Choose med-small for your needs, v cheap but need small flat-headed screw driver. Small sharp knife to peel back insulation, about half inch. Once all wire ends correctly tightened down, can test lamp. If all OK, secure to ceiling and cover, etc. In HK all household voltage is 220V, very potent. In USA only half that voltage and less dangerous.