Make sure you spend enough time on the beginning, middle and end of the presentation, and not spend a lot of time at the beginning and rush the rest at the end.
Rehearse emphasizing the key points of the presentation, including gestures, if appropriate.
Think of possible questions the audience may ask, and rehearse the answers for those questions.
If you recognize you are using fillers or sentence starters, then consciously rehearse the presentation without using such distracting words and sounds.
It is a good idea to record your delivery using a portable voice recorder and analyze it for clarity, pace, fillers (such as "umm," "ahh") and sentence starters (such as "like," "basically," "you know," etc).
Make sure you are familiar with the delivery technologies, and if you have advance access to the presentation location, load the presentation on the chosen technologies and test it.