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Removing fence posts that are set in concrete is something you can't do by hand. You will need an excavator, a strong post-puller, or a jackhammer. If you plan on recycling the concrete base, you may be able to cut the post out with a jackhammer and then set the new post in the existing base. However, it's usually better to remove both the fence post and concrete together. Due to the weight of concrete, you will need a hydraulic removal tool.

On most untreated wood fences, there is no need to sand before treating. You typically only need to sand if there’s an old coat of paint or stain on your fence. If you do need to sand off a previous paint or protective coating (like an old stain or sealant), use medium-grit sandpaper.

Ideally, your concrete should set slightly above ground at an angle sloping away from the fence post. This will add extra support and allow water to run away from the wood fence post. Keeping water out will help prevent wood rot. Additionally, you can add soil on top of the concrete for a seamless finish. 

Posts for a horizontal fence should be no more than 6 feet apart. Wood pickets are not as strong when mounted horizontally as when mounted vertically. As such, the fence panels on a horizontal fence can’t cover the same span between posts as a vertical fence can. If you install the posts further apart on a horizontal fence, the fence will lose stability, making the boards more likely to sag.