This simply isn't true. If you have to "hard-sell" a deal, then it probably isn't a deal. When you walk into a meeting or a boardroom full of investors - your position of strength is the deal itself, not your ability to sweet talk or negotiate it.
Once you have done your homework on a property, supplied a list of comparables, and furnished a solid set of financials to show what a phenomenal deal this is, you won't have to do any convincing; the numbers will speak for themselves.
Also keep in mind that what you would probably consider a negotiation meeting, is simply just a meeting to present the deal. Remember, you've already done the homework. You have the numbers all figured out, and you are confident what the value of the property is and why it's worth what it is.
Now, there may be times, when your deal isn't someone else's deal. But that's okay. There are many other individuals for whom the deal will work. If you have to beg someone to see your deal, then you probably don't want them as an investor. Investors who can see a deal, will want to participate. There is no real trick to this other than applying knowledge and being diligent in research. No matter what your personality or background, you have the ability to put together a great deal (this is where I can help), and you can attract the investors that you need.
If you are the type of person looking to find that great deal (and possibly find investors), then please feel free to contact me directly (firstname.lastname@example.org). Let's talk and see what we can do to help you on the road to financial independence.