You can file a dissolution on your own. Depending on what county you are in, some may be more difficult than others. For instance, here in Missouri, in St. Louis County, there are some services set up to help with this. On the other hand, the surrounding counties like St. Charles, Franklin County, St. Louis City (separate from St. Louis County), and Jefferson County, which admittedly are much smaller, do not have the same resources. Additionally, none of these resources can give you free legal advice.
For legal advice, you need to hire an attorney. Some people may qualify for legal aid with places like LSEM or CLAM, but many do not and, these organizations do have problems meeting the huge need for their services even for people that do financially qualify. If you look up federal poverty guidelines, you will get an idea of who qualifies. The levels are extremely low and depending on the size of household, can be between income of approximately $14,000 a year and $35,000 a year in income.
The legal community sees that there is a need for people beyond these lower limits that is not being met. It offers as a solution Limited Scope Representation. You can represent yourself for most of the case, but get legal advice when you need it.
Bottomline: You can file a dissolution yourself, but you may want some advice along the way.