You may not need the support and advice of a divorce lawyer if your situation is straightforward. The most complicated part of the divorce process is dealing with the financial matters surrounding it and also issues involving the children (i.e. where they should live and/or how often they should spend time with the other parent. We have a guide on child arrangements and what options are available to you.
So whilst you may not need a solicitor to deal with the process of obtaining a divorce, it is always advisable to seek advice to deal with the legal aspects surrounding financial matters and matters concerning any children of the family.
It is worth noting however that if the divorce application is not completed correctly, you may not be able to make a financial claim against your ex-partner further down the line and so if you are unsure how to complete the divorce application, it is always better to seek advice from a specialist divorce lawyer.