If your faucet is leaking and you want to save money, replacing the bathroom mixer tap is an easy way to do it. A cartridge is easier to replace than the handle and is not as difficult as a single handle faucet. The other option is to buy a new faucet altogether, but this could be time-consuming. And in the long run, it may not even solve your problem. So, if you're having a hard time replacing the handle, consult a professional or do it yourself.