Read the self-help books (check out Nolo's books and others).
Try to file written declarations and a trial brief (it stays within the record & Commissioners will usually read them; in court, you frequently get very little time to explain your position).
Look in the books.
If you can't afford an atty, go to your county's Law Library. The librarian can point you in the right direction to research info.
Many attys will 'unbundle' their services - you do not have to retain them for the entire case - you can simply hire them to draft the brief, setting forth your issues, or for an appearance, etc.
The greatest danger in that, is the atty is not too familiar with your case (but, some retained attys aren't well-versed about their cases
).
If you can state your issues succintly, and your requested solution is easily stated, 'unbundled' services may be a great choice for you.
Some Commissioners bend over backward to assist 'pro pers'.
You do have to have your issues/information clearly stated (in writing is best) and your requested solutions to present to the Judge/Commissioner.
Good luck.
Many excellent attys are selling 'unbundled' services now; you only have to pay for a few hours of their time, and they can advise you of the process and pitfalls.
This web site has excellent family law advisors.
Why not tell them what the issues are and see what specific advice you receive ?
At worst, you will get a good reality check; at best, the advice from the senior posters is as good as a panel of family law experts ...