Ask HN: How to stop making obvious errors

It seems no matter what I consistently make obvious errors. Yet if I double check I often miss these errors. Simple things like spelling errors I can look right at an not notice until the next day. If I look at the code, doc or email a day or two later it's obvious to me. But I could not spot it while doing the work. I desperately need and want to overcome this. Have any of you experienced this and found a way to better your self?