Sidious' plans to kill Obi-Wan and Qui-Gonn is successful at the start of TPM. Now what?

What was his goal with having the Jedi killed at the 'diplomatic' meeting? It feels that a combination of both sides ineptitude and exceptional luck (on both sides of the coin) led to things falling in place for Sidious to become emperor and without Obi-Wan and Anakin he'd have failed at every hurdle.

So what was the actual plan?