Jupiter, moons, and their shadows.

I was reading about the three shadow on Jupiter event that is comming
up on March 27/28. I'm hoping for clear skies that night because this
whole sequence is very conveniently timed for viewing in California
(Starting about 2210 on the 27th and ending at about 0110 on the 28th
with the 3 shadows on the moon right about midnight).

Now, I haven't actually tried to see a shadow transit yet but I should
be able too (Celestron C9 1/4). Assuming I get clear weather between
now and then during a time I'm home and there is a shadow transit, I'm
going to give it a practice run. Is there any advice that you can
give for doing this viewing?