The date on which earnings (including retirement contributions and other income) becomes separate property again, is the so-called “valuation date.”  The valuation date is the date of the initially scheduled prehearing settlement conference, unless the parties agree to a different date, or the court finds that a different date is fair and equitable.  In my experience, the Court seldom exercises its discretion to use a different date. One situation warranting a different date is where the parties have been separated for years prior to commencement of the divorce, and have been living separately, with separate accounts, insurance, bills, etc., during the separation period.
Unless your lawyer thinks it's important that you be represented, try the first session without your attorney. (If your spouse is insisting on having an attorney present, you'll want to do the same.) If you're not represented, but you've asked a lawyer to be your consulting attorney just for purposes of mediation, then you'll likely attend the first mediation session on your own. Either way, if you go by yourself and then you find that you can't state your position clearly or stand up for yourself alone, then consider bringing your lawyer to later sessions.
Divorce is actually a legal procedure between you and your spouse, so, in order to satisfy legal requirements, you must properly notify your spouse that legal action is being taken against them. In a divorce proceeding, this is called Service of Process, and involves delivering copies of the Petition for Dissolution of Marriage and Summons along with supporting documents to your spouse in a timely manner.
If your spouse does not wish to contest the Petition for Dissolution of Marriage, they may file a Summary Dissolution jointly with you with the court. This obviates the need for a trial and allows parties to submit evidence in written form. To use this uncontested divorce procedure, you and your spouse must meet the following eligibility criteria:
A spouse is not liable to (responsible for paying) creditors for debts of the other spouse except for necessary medical expenses and household articles and supplies used by the family while the spouses live together. A spouse is liable for credit card and other charges by the other spouse if both had agreed to be responsible to the creditor. A spouse may also be liable for credit card debt if that spouse has used the card in the past. Either spouse may close a joint credit card account at any time. In some cases, it may be wise to cancel credit cards immediately.
In Minnesota, Marriage Dissolution proceedings, or divorces, are viewed as "no fault" proceedings. This means that a spouse does not have to prove the other spouse was at fault or did something wrong to cause the breakdown of the marriage to obtain a divorce. Either spouse may commence a divorce action by simply alleging that there has been "an irretrievable breakdown in the marriage relationship" - in other words, that in their opinion, the marriage is dead and there is no chance of reconciliation. If one spouse feels this way, even if the other disagrees, the court will ultimately grant the dissolution of marriage. Early in the process, if you do not believe that there has been an irretrievable breakdown of the marriage, the option of marriage counseling is possible. Unfortunately, if a spouse has set their mind to divorcing the other, it is unlikely that counseling can repair the marital relationship.