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Don't automatically avoid a project just because it involves electricity: Replacing a standard light switch with a dimmer switch is a very doable DIY project, as is replacing a three-way switch.
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Many things can go wrong with a deck. Missing screws, warped boards, squeaky nails, wobbly railings, fortunately, many of these problems are well within the scope of the average DIYer. Inspect your deck for seven common deck problems and then repair whatever needs fixing.
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Obviously you can't glue broken glass back together. But, for windows that get stuck, let in drafts or have moisture issues, there are DIY solutions. Fix old windows, double-hung windows, window glass glazing and screens. You can also stop window drafts and learn how to avoid and remove window condensation.
If you want to take on a larger task, you can even replace your windows!