There is, of course, a vast theoretical and research literature on phenomenology as a methodology (understood as a research design approach) but if you are looking to get a handle on what phenomenology is about as a research methodology and some superb examples of phenomenological analysis check out Max Van Manen’s website Phenomenology Online. Start by clicking on “inquiry” then “methododology” but don’t stop there–there are loads of good examples. After that explore the rest of the site.