How does one go about an out of state divorce?

This question is too vague, speak with a local attorney for specifics.

One of the parties has to be living in the state in which the divorce is filed. The procedure varies with each state so what has to be done will depend on where the divorce is filed.

IF you mean you need a divorce in one state, but live in another, then the best way is to hire an attorney who practices in the State where you need to get divorced. That way, you may not even need to travel to that State if you need to attend hearings, mediation, trial, etc.. You can appear by phone with the assistance of an attorney.

You need to much better articulate what you want.

Your question is not clear. Do you want to file a divorce in some other state than the one you live in? Or do you want to start a divorce against a spouse who now lives in another state. It is possible in Wisconsin, if you have lived in this state for at least 6 months, and at least 30 days in the county where you file, to begin a divorce here no matter where your spouse lives. The court's jurisdictiondepending on the factsmay be limited tro authority over the marriage, but not over the husband. That is, it may turn out that the court can dissolve the marriage, but might not be able to force the husband to pay support or divide property. In that case you may want to find a lawyer in the state where he resides. But do consult an experienced family lawyer. They can help untangle many knots.

If you are referring to one spouse being out of State, you may file your divorce in the County in which you are a resident and serve your spouse with the papers through the Sheriff within the County in which your spouse lives.