No matter how new or how well-built, every house needs work or maintenance on a regular basis. You can pay professionals to do it all, of course, but if you’re looking to save a little money (or just want to learn and be in control of your home maintenance fate), there are plenty of home repair jobs that can be DIY’d. If you’re a beginner who’s just getting started on DIY maintenance and repair, however, you should watch out for some easy and common mistakes inexperienced DIYers make.

While some of these mistakes will be obvious the moment you make them, it’s also easy to get through an entire project and experience superficial success, only to see that success slowly fade into failure because you’ve made a simple error. If you go into your next project with these easy DIY mistakes in mind, however, you can avoid a lot of problems.

Over-tightening is never a good idea

One of the most common mistakes beginner DIYers make is to assume that if tight is good, extra tight is better. This is especially true for plumbing jobs. We all fear water leaks and how easily they can destroy whole sections of your house, so it seems to make sense that when you’ve replaced the trap under your sink or swapped in a new drain or faucet, you should tighten those connections as much as you can. But over-tightening any connection, bolt, or screw can lead to disaster because it can cause small, subtle cracks that lead to failures and leaks that may not become evident until days or weeks later.

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Additionally, tightening things until your eyes pop out of your head usually means that trying to remove that fitting or bolt later will be almost impossible. If you want to be kind to Future You (or the next person to own your home), avoid over-tightening. A good rule of thumb is to tighten plumbing until it’s watertight, then stop, and to tighten screws and bolts only as much as necessary to get the job done.

Caulking an empty tub will cause your job to fail faster

Re-caulking a bathroom every few years is a very good idea. Caulk isn’t forever, and even a tiny failure can allow damaging moisture to invade your walls and floors. And caulking is a DIY job almost everyone can do to an acceptable standard.

But if you’re recaulking a tub, the easiest mistake to make is to do it dry. That’s because water has mass. A gallon of water weighs about 8.34 pounds, and standard bathtubs hold anywhere from 80 to 100 gallons or more. When full, a tub will sink slightly, so if you caulked when it was empty, it will immediately strain and stretch the caulk, and your caulking job will fail pretty fast. Always caulk with a full tub.

Forgetting to shut off the power or water can lead to costly (or deadly) accidents

If your goal is to destroy your house and possibly yourself, then you should definitely dive into a DIY project without bothering to locate and turn off the water and electrical supply to the areas you’ll be working on. Not only can one wrong turn of the wrench on a pipe send a torrent of water coursing into your house, but working with any exposed wiring that hasn’t been confirmed to be cold is just foolhardy. Turning off the water and power to the areas you’ll be messing with might seem like an unnecessary complication for a small, quick job, but if your hand slips or a component fails, you’ll be very glad you took the time.

Not testing your equipment first can lead to problems later

When we buy tools, we assume they're going to work. And they usually do! But when that tool is crucial to the success of your DIY project, you should verify that it works as expected before you rely on it to be both accurate and safe to use. Stud finders, voltage testers, digital tape measures—any tool that measures or detects should be tested for accuracy by using it somewhere you know what the result should be (e.g., a working power outlet for a voltage tester) and/or comparing it to another tool or source (e.g., a physical tape measure or an object with a verified length). Otherwise, you could be working with inaccurate or incomplete information without realizing it.

Forgetting your saw's kerf is the fastest way to mess up a precise cut

If you’ve never heard the term "kerf," you’re not alone—few DIYers likely have. The kerf is the width of the cut your saw blade makes, in addition to whatever cut you've measured. This can be crucial, because that material is deleted from the wood you’re working with (transformed into sawdust)—and that means your cuts can end up wider or narrower than intended.

For example, let’s say you have a board that’s a little more than 3 inches long (76.2 millimeters), and you’re using a standard circular saw blade that’s about 3mm thick. If you cut that board in half and push the two sides together, your board is now only about 73mm wide. The blade ate up and spa

15 of the Most Common Beginner DIY Mistakes (and How to Avoid Them)