President Trump is one step closer to getting a new trade deal with Canada and Mexico.

But he has many, many more steps to go.

On Wednesday, Trump's trade team officially begins renegotiating the North American Free Trade Agreement, the three-nation pact that went into effect in 1994.

A new NAFTA will probably take more than a year to enact, and possibly longer, depending on negotiations and political forces in the three countries.

Here are the other milestones required by law, according to the Trade Benefits America Coalition, a group supported by dozens of large business associations and Fortune 500 firms, including Microsoft (MSFT) and Walmart. (WMT)

This is where we are now

1. Talks begin Wednesday. The first round is in Washington, and future ones will be in Canada and Mexico. Talks are expected to go until about the end of the year or early 2018 -- assuming all three sides come to an agreement, which is not guaranteed.

Before Trump can sign the deal

2. 180 days before signing the deal, Trump's team must submit a report to the congressional committees on the potential changes to U.S. trade law.

3. 90 days before inking it, Trump must notify all of Congress about his intent to sign the deal. On the same day he must give the details of the agreement to the U.S. International Trade Committee, an independent panel of judges.

4. 60 days before signing the deal, Trump's team must publish the text on the website of the U.S. Trade Representative.

Related: Trump spells out his wish list for NAFTA

Before Congress gets the deal

5. President Trump can sign the deal.

6. 60 days after entering the agreement, the administration must provide a public description of the changes to U.S. laws in order to bring the U.S. into compliance with the deal.

7. 105 days after Trump signs it, the ITC publishes a report assessing the economic impacts of the revised deal.

8. 30 days before submitting the bill to Congress, Trump must send a statement which includes the final legal texts of the deal.

9. Before introducing the bill to Congress, the administration is required to submit a review of the deal's impact on employment and the environment, and a plan for implementing and enforcing the agreement.

Related: Japan and the European Union ink a new free trade deal

After new NAFTA is introduced to Congress

10. 45 days after submission, the House Ways and Means Committee must report the bill, meaning it needs a majority vote in the committee to go to a full House vote. The committee could also suggest amendments or other tweaks to the trade deal.

11. 15 days after that, the full House of Representatives must vote on the bill.

12. 15 days after that, Senate Finance Committee must report the bill.

13. 15 days after that, the full Senate votes on the trade deal.

14. 30 days before officially entering into the agreement, Trump must send a letter to Congress saying he's determined that the United States has taken measures necessary to comply with the agreement.

Related: Spurned by Trump, Mexico and China talk up potential trade deal

Take a breath, because even that timeline comes with caveats.

All those days Congress has to consider the new NAFTA are legislative days -- not real, calendar days. In total, Congress gets 90 legislative days, which could in reality stretch over several months.

There's more. The governments of Mexico and Canada must also ratify the agreement while this is going on. If they don't ratify it, there's no new deal.

That's important to remember because Mexico holds presidential elections in 11 months, and the leading candidate, Andres Manuel Lopez Obrador, a Trump critic, has threatened to get tough on U.S. trade. It's unclear what he plans to do, but if he gets elected, the official U.S. timeline for renegotiating NAFTA would likely get wrapped up in Lopez Obrador's presidency.