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You need to know enough about it to do it safely and ideally test your work as you go along to ensure everything wired up correctly. If your current light is a 3 plate fitting and you understand how a 3 plate works then you should be able to carry out the work without breaking any rules. Just make sure you use the correct IP rating for the lights which varies depending on how close they are to the bath.
In practice it's a fairly advanced diy project but the regulations wouldn't prevent you from carrying it out as long as you follow the code for safe electrical work.
I'd like to replace the standard hanging light fitting in my bathroom with so flush mounted led spotlights. Is this something that can be done DIY or do i need to employ an electrician?