I need some advice and I know you all have plenty to offer

In about 2.5 hours I have to give a presentation on an artist/work of art of my choosing, and it has to be 10 minutes or I will get graded down. Right now, my notes constitute about 10 minutes worth of yaking. But, the problem is I did this same thing (different piece/artist) last semester and thought I had myself covered, but then I spazzed out and spoke quickly and ended up with 6 minutes. And, that was in a museum setting with me leading a mock tour, so part of that was me asking the audience questions and getting their answers. So I maybe only had 4 minutes.
This time I definitely feel more prepared than last time, but I'm worried I will rush through it. What can I do to slow myself down and make sure I say everything I planned? As of right now, I am planning on passing out 2 catalogs of the artists work which will kill a little time, and I going to wear a high collar shirt so I don't have a panic attack when my chest turns bright red because OMG THEY ARE ALL LOOKING AT ME.
Any advice? I'm not nervous yet, but I know it will set in soon.