The first thing to realize is that most of the data from tools (excluding analytics and such) are basically estimates of estimated data, or are directly from Google’s various estimation-type tools (Keyword Tool, Trends, Insights, and so on), or driven off what the tool builder thinks are important or reliable metrics to build your research off of (there tends to be some swings and misses with that type of approach).

You are not going to fail miserably if you decide not to do days and days and days of keyword research with multiple tools and then spending more days comparing different datasets. Research is important, but there is a limit.

I am not “house” handy by any means, I can barely hang a picture frame straight. So if you gave me the best construction tools in the world I’d still make extra holes and screw something up.

Even if I managed to get the picture hung correctly, it certainly would not look professional.

You can buy as many guides, tools, and accessories as you like but in the end it is your skill that determines the success or failure of a project (building a deck or building a website). Skills can be harnessed, but tools do not overcome a lack of skill.