"Negotiations for beginners" IMHO:
Once you've procured your list of potential "leads" (via Google, what have you), and have a good sense of the domain's value (from the Appraisal's), it's then time to customize and fine-tune your own personal "marketing letter" (see examples in this Forum).
Wait for a response! Listen/comprehend as to what is being addressed in that response. Is it primarily focused on the potential cost (in which case, the sale has been made ... if you're willing to be "reasonable"). Or, are they mildly interested, but can't seem to understand WHY it could be useful/advantageous for their entity (in which case, the sale might still be made ... if you can openly and honestly display your Google/OVT results, etc). Or, are they irritated, and can't understand why you even contacted them (in which case, sale may still be made ... if you address the potential needs of the recipient and clearly EXPLAIN your reasoning for contacting them in the first place).
Put yourself in the e-mail recipient's shoes when sending your letters. Be polite, open, and professional ... don't waste their time by not "pre-qualifying" the domain yourself for their suitability. If you're asked WHY you contacted them ... be sure to be ready with an answer not full of bologna.
FYI: NOT all domains can be sold! MOST domains likely will not be sold. MANY are sold each and every day ... and the basis for your negotiations will always be your confidence in the domain for your intedended list of leads.
PS. Asking for ridiculous (ie., unreasonable) prices is a sure fire way NOT to make sales! IMHO.
* These are general principles of negotiations that I happen to believe in, and over time have proven successful for me, as well as others that I know. Results will vary.
Good Luck with your marketing efforts, and domain negotiations.