toastmasters

you just have to get up there and do it.  do it often.  find reasons to get in front of people and speak, and never be afraid to fail.  embrace your failures.  eventually, you'll have done it so often, you'll actually be good at it.  maybe even look forward to it.

Practice^3 and never work on the project the night before. Rookie mistake. 

Also, toastmaster works well. I've got a few friends who used to run the local group.

I had a few studio profs lock up and counted all the presentation material at the end of the school day the day prior to reviews. This way no one burned the night away scrambling for last minute changes. But this was all hand drawings and bass-wood models.

Yea all nighters suck. I really would not do them unless I had to. It's just hard to know when to call quits on a project. Thanks for the tips, I'll try seek out a toastmasters in my city, sleep and rehearse.

I sit through a lot of presentations and have witnessed a lot of good and bad presenters. So much so I wrote an article about it. I think the largest impact on the whether or not I walk away impressed is if you're excited about what you talk about.
See this - http://spec.ninja/blog/Presentations+from+the+perspective+of+the+audience/8

as recommended toastmasters, take your project to the local mall and present to people who stop and look (we did this one semester at the university), present it to your family, watch youtube videos of people presenting stuff, watch infomercials of presentations, watch other architects at local city commission video or go to the local commission meeting they are typically open to the public