Clogged or jammed garbage disposals are some of the easiest repairs to make. You don't even need an extra tool because every new garbage disposal should come with a hex wrench attached to the disposal itself. Your garbage disposal should also come with instructions on how to properly repair the disposal if it gets jammed. Always make sure the power to the disposal is turned off at the source before you attempt any repairs. Make sure you know what types of foods are intended for garbage disposals, and run it as often as you can to prevent clogs or jams.
To work independently, a plumber is required to receive a license. In most states, the prerequisite for earning this license is two to five years of practical experience. There's also an exam to test technical know-how and understanding of plumbing codes. The United Association's website offers extensive information on licensing requirements by state.
A leaky faucet can be a relatively easy fix depending on the type of faucet, so get to know the basic types of faucets and how to take them apart. You can look for instructions online; YouTube videos are the most useful. A slow drip usually means that all you have to replace is a washer, but make sure you know which size you need before buying a new one.