The most important steps in all the phd procedures is: literature review. If you plan it well from the first day then you saved urself alot of time,effort,repeated work,plus u will be able to have a big picture that will help to to specify ur research question,if u do not have a clear and focused one.
Planning and organizing for literature review starts actually before starting ur phd program. It starts when u write ur admission letter including your intentional research.
Literature review will (offcourse) ease ur proposal writing which is one of the bigesst step in ur journey.
And offcourse the well plannes and organized literature review will help in publication,writing research proposal,and make u realize other venues for ur research area.
Finally it is the greatest help in writing ur dissertation….