Many plumbing problems are straightforward enough to resolve without the need for a plumber, providing you have the correct equipment, and some reliable instructions or advice. You should always switch off the water main and dress appropriately.
Always turn off the water main before attempting a plumbing repair.
Plumbing is a messy business. Always assume that you will get wet and dirty; dress appropriately.
Preparation and tools are important. Ensure measurements are correct and that you have everything you need before you start your repairs.
Keep a professional plumber's phone number handy in case things go wrong and you need help quickly.