It can be hard to know when to seek legal advice. There are many advantages to doing it, but it may very well be the case that the problem could be solved by yourself or that you should seek advice from an entirely different place.
The type of problem you have can change where you get advice from massively. If you are considering divorce for example then a solicitor can be a good place to get advice on the process. But therapists and councillors can also be a good source of advice on the issue. After all they have also spoken with many potential and occurring divorcees.
Online is a great place to go for advice too. There are many forums and blogs available on all kinds of personal issues. People who have been through legal issues tend to pass on the information to others, to pass on their wisdom. It is wise to take online advice with a grain of salt though. The advice may be heavily bias and it will be up to you to discern what is accurate or not.