Following are few mistakes that you should try to avoid , when delivering a sales presentation.
1. Unclear thinking / Lack of preparation
If you can't describe the objective of your interaction in one sentence, you may be guilty of fuzzy focus— trying to say too much at once. You'll confuse your listener and that doesn't make the sale. At any stage of the sales process, you should know in advance why you are interacting, what benefits you are offering your prospect or client, and what you'd like the next step to be.
2. No Emotional Connection
The most powerful communication combines both intellectual and emotional connections. Intellectual means appealing to educated self-interest with data and reasoned arguments. Emotion comes from engaging the listeners' imaginations, involving them in your illustrative stories by frequent use of the word "you" and from answering their unspoken question, "What's in this for me?"
3. Failure to include the customer in the presentation
This occurs when the sales person thinks that the presentation is all about his product, service or proposal. The truth is that effective sales presentations are always about two things: the offer, and how it can impact the customer.
When sales people simply talk about their offer, and ignore the second half of the equation, they make one of the most common mistakes.
Customers are far more interested in how the thing being presented impacts them, than they are in the details of the offer.
4. Speed talking
Most sales people will agree that they talk too fast. It's good that we can admit that, but not so good if we don't do anything to correct it.
Since most of us speed up even more when we're nervous or anxious, reduce your nervousness - and your speed - by practicing your presentation in advance. You can also slow down your pace by asking your audience questions, then being quiet while they answer.