I have never gotten on well with a tablet and I have a big, high end Wacom I "liberated" from a former employer.  I've tried countless times and each time the damn thing nearly sailed out the window.  

That said, I can tell you how to draw accurately, or at least, in the "real world" as it were.  This will sharpen up your drawing technique no end...

Learn to draw with a brush.  

Seriously, it's damn hard work but you will learn a lot about accuracy that way.  Getting used to inking pencils the old school comic book style is the single biggest favour you will ever do for your drawing skills.

Coppula eam se non posit acceptera jocularum.

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