What is the best way to upgrade the audio system in my Nissan Micra?

I own a 2015 Nissan Micra and I want to upgrade the audio system to improve the sound quality. Can I install a new head unit or should I just replace the speakers? Would it be better to have a professional do it or can I do it myself?

If you want to improve the sound quality in your Nissan Micra, it's best to replace both the head unit and the speakers. Installing a new head unit can provide better sound control and options, while upgrading the speakers can enhance the overall sound quality.