Epistemological issues may need to be explored before looking at methodology. Methodology and data analysis will need a different approach to the literature than that used in the main body of the review and should be separate explorations of the literature. Even when there is a standard methodological approach it is worth exploring possible alternatives and their validity in relation to your research. Indeed, a different approach from that used before may underpin your research.
There are many tools available to assist with data analysis so it is worthwhile spending time to explore these to find one that suits your research and with which you feel comfotable.