The LCROSS impact is on the
9th! You definitely will miss it if you try on the 10th. Its scheduled for 11.30UT on the 9th October.
There are some detailed pages set up to give amateurs a guide to viewing it, and it is anticipate that people with a 10" may be able to video it, but as mentioned the moon will not be up at the time of impact! It looks like its being timed to benefit the Americans, and as we are on the other side of the world....
http://lcross.arc.nasa.gov/observation/amateur.htm
By the way, only one very large professional telescope, in the metre class, managed to detect a couple of pixel-widths of explosion from Kaguya. I can't remember which scope it was, but it was an Australian one, I think.