Need repairs for leaky toilet flush in bathroom

I have a standard toilet with a leaking or sticking flush mechanism. The issue started slowly, but now it drips and sometimes won’t fully refill after flushing. I’d like a handyman to inspect the cistern, check the fill valve, flapper seal, and any worn parts. Please advise if a simple replacement parts kit will fix it or if a full unit replacement is needed. Access is straightforward, and I can accommodate a weekday morning visit. Basic tools and parts should be considered; I’m happy to pay for any necessary components. Friendly, clear communication and a short follow-up if further adjustment is required would be appreciated.