How to negotiate better salary

Overall  Guidance:
1. Negotiating salary is one of the most important skills during the job hunting.
2. Because less negotiation skills, people made less money than what I worth.
3.

Practice:
1. Overcome fear
2. Overcome execusing the offered salary
3. Overcome humility
4. Overcome low self-esteem
5. Overcome lack of confidence
6. Overcome apathy
7. Overcome strange notions

Steps:
1. Overcome any reticence about asking for a higher salary
2. Steel yourself to ask
3. Build your case by pinpointing exactly what it is that your employer should take into account when determining whether to increase the salary offer.
4. Do your research about ideal salary
5. Practice pitch
6. Start negotiating. Know the lowest salary you'll accept and the highest amount you'd like (see next step for reasonableness). Then, always start with a figure higher than what you really want––this means knowing in advance what your bottom line is. This provides leeway to negotiate down and reach a "compromise". If you're lucky, it'll be right where you really wanted it.
7. Be realistic and reasonable - If you've done your research and judged that it's appropriate to do so, you can make suggestions of compromise during a negotiation that open up the possibility of different types of reward, such as additional leave, time off to volunteer, annual bonuses or stocks, a larger office, flights home if you're working interstate, a personal development course, membership to a club, a car park space, etc. In many cases, the company may have leeway on non-monetary recompense that they'll be happy to add to your package.
8. Be prepared for "no" as another possibility
9. End the request on a positive note, however it has been received by your future employer.
   -Don't gush and thank them for considering it with oodles of superlatives. It sounds desperate
   - Never turn a "no" into a backlash, such as pointing out you know that everyone else in the new firm is getting paid heaps more than you, blah, blah. This is an invitation to withdrawing the job offer!
10. Get the offer in writing.

Pinpoints to negotiate:
1. your level and extent of experience in the field
2. your educational background, including ongoing education and expected future education
3. your ability to draw new clients or use your contacts/network
4. your level of knowledge about your new employer, along with knowledge of competitors and how to take advantage of this knowledge for your new employer's sake.

Research about ideal salary:
1. Check salary guides (many exist online but ask at the local library if in doubt)
2. Talk to your mentors and former bosses
3. Talk to colleagues to see if they can point out skills that really stand out for them in their experience and ask who has demonstrated these skills in the past
4. Talk with clients if relevant and get their feedback on your value
5. Look into what the company has traditionally paid employees in your role.
6. It's recommended that you reach a reasonable figure to give as a suggestion to your future employer. It's harder to say no to a specified, thoughtful and fair figure than to an unknown and possibly "sky's the limit" request.

References:
http://www.wikihow.com/Negotiate-a-Higher-Starting-Salary