Pro Plumbers

The video above from Lowe's shows how to fix leaks in all three types of single-handle faucets. Basically, you're going to remove the handle, pop out the mechanism, and replace it or the surrounding seals. If you can spot which part is causing trouble, you can buy each of the pieces individually. Otherwise, you can buy a faucet repair kit for that type of faucet and replace everything at once. Neither option should be very expensive.
Garbage disposers usually come with an Allen key. Find a good place to store it, and when the disposer jams, you can follow the directions in the owner’s manual to fix it yourself. It’s as simple as inserting and twisting, and doing this yourself will save you the hassle and cash of a service call to the plumber. Speaking of tool storage, check out these clever tool storage ideas.
The word "plumber" dates from the Roman Empire.[3] The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes[4] and some were also covered with lead, lead was also used for piping and for making baths.[5] In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall".[6] Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.