5. Prepare, prepare, prepare
You'll have a good Seder if you have a good plan, are prepared and know when you want to ask, do, show and tell.
6. Know your audience
Who will be around the table? Will some people are attending Seder for the first time? Then it would help if you kept that in mind too. It's also safe to say that even those who attend regularly won't remember everything, as it's once a year. Make it interactive, and if there are children, you also need to think about how you'll tie them down, so there's something to snack on the table.
7. Are we there yet?
There will always be people at the table who are impatient, wanting to get to dinner already. People who ask you to skip portions. Don't do it! Don't rush through the Seder under any circumstances, or you'll lose the point.