What is your project? Obviously a bathroom, but what? A total gut job or replacing fixtures?
I don't know your capabilities. Or what you actually mean. Replacement, gut job, brand new?
I suggest you go to youtube.com website and enter your question. There could be hundreds of tutorials there for you to view and see which one most applies to what you are wanting to do. Amazing the education you can get there. You may have to ask your question a few ways to get the exact help you want but you'll be learning a lot in the process.