Need help to replace a toilet flush system

Hello, I have a faulty toilet flush that needs to be replaced in my bathroom. The current flush is leaking and not working properly. I would like someone experienced to come and install a new flush system. Ideally, the person should bring the necessary tools and be able to advise on the best replacement options. The job is in a residential home in Dublin. Please let me know your availability and estimated time to complete the work.