Wrenches
There are many types of wrenches, but the two main types that will prove very handy for you as a do-it-yourself plumber are: adjustable wrenches and pipe wrenches.

Adjustable Wrenches
You can open or close adjustable wrenches to fit nuts, bolts of several sizes and fittings that have flat sides. You can find different sizes of adjustable wrenches that may range from 4" to 2' long. However, you, being a do-it-yourself plumber, can do with 10" to 12" handle only. They are good general-purpose-size wrenches. When you are using an adjustable wrench, make sure you have positioned it in such a way that the force applies against the fixed jaw.

Pipe Wrenches
Pipe wrenches are useful when it comes to gripping and turning threaded pipes and pipe fittings. Their adjustable and toothed jaws are specially designed for the purpose. These wrenches are available in various sizes that can range from 12" to 18" in length. Larger wrenches are suitable to fit larger pipes. In pipe wrenches also, make sure while using it, you are applying the force against the permanent jaw, and not the adjustable one.

Pliers
A do-it-yourself plumber must have the following pliers available to him/her.

Rib-joint Pliers
These tools are very handy when it comes to turning pipes, nuts, and fittings. You can adjust the size of its jaw by sliding the pivot along the slot and engaging it at various positions. This way, you can use it to firmly grip objects of various sizes.

Locking Pliers
You can use these pliers for clamping actions. You can use these tools to lock a bolt or a pipe. You can also adjust the size of the grip by using the knurled screw mounted in one handle.

Screwdrivers
Screwdrivers are multipurpose tools. Whether it is changing faucet washers or dissembling plumbing related appliances, these tools come in handy. You must have various sizes and types of screwdrivers available to you. It is better if you have two or three sizes of each standard. If you have a 4-in-1 driver, it can be very useful for you. Make sure that the drivers fit closely in the screw's head, otherwise both the screw and the tip of the driver can be mangled.

Pipe Cutters
A few types of pipe cutters are also very handy for the purpose. There are pipe cutters that you can use to cut copper or steel pipes. Their sharp cutting wheels and adjustable jaw are specially designed for such purposes. Another type is a plastic tubing cutter that you can use to cut rigid and flexible plastic tubing like sprinkle pipes.

Measuring Tape
Sometimes, you need to measure runs of pipe. In such cases, measuring tapes come very handy. When it comes to measuring tapes, a retractable steel tape is the best choice for you. Moreover, it is better if you have a 25-footer measure tape, as you can easily extend its blade for several feet without any support.

Drain Clearing Plumbing Tools
When you face the problem of clogged drains, drain-clearing tools can be very useful for you. Some of the drain-clearing tools include drain augers, toilet augers, hydraulic blow bags, and toilet and sink plungers, etc.

These tools are essential for do-it-yourself plumbing jobs. They are very useful and can make your work much easier.