There is no law that requires you to use an attorney. However you may find it worth the money - depending upon how comfortable you are working through the various issues and filing the appropriate paperwork.
Whether spousal support is an issue in any particular case is not simply an issue of whether someone makes more money than someone else, but based on a full analysis of the length of the marriage and its economics. The law has changed a bit in the past five years - but whether those changes will make any difference to you or not can't be analyzed without a detailed review of your situation. Your lawyer is in the best position to handle this.