The ease of replacing a bathroom sink can depend on various factors such as the type of sink, the complexity of the plumbing, and the skill level of the person doing the installation. In general, replacing a bathroom sink can be a relatively straightforward process, especially if you have some plumbing experience or are comfortable with DIY projects. However, if you are unsure of your abilities, it may be best to hire a professional plumber to ensure that the job is done correctly.