I honestly need your observations on how best to negotiate if the job offer has to do with emerging company where job descriptions are not definitely and specifically stated?

Know your alternativea it gives you power when you are negotiating

The information provided in this section demonstrates the need to research and compare salary and benefits. This is essential to negotiations for a particular position.

How a shy person could do all this

I have by several spoil my career by accepting the fist offer of salary. I am always paid more less than what I worth because I am ashamed to discuss money. Please help me know how could I correct this mistake if i have already accepted an offer This is a very disturbing and embarrassing think that happen to me in my whole life. Please me

" know what your walk away is "

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done

"And the only way to know if it's fair is to attach it to some outside objective standard. It is always surprising to me, it seems very intuitive and very obvious but most people don't do this homework and know it". I didn't get to understand this part so would please clarify more?

Objectives, Clarity and your unique input to organizational development all play a major role towards the negotiation.