A few months ago I've conducted my first case study. For 2.5 months I've followed a film score project between a Melbourne-based filmmaker and a Sydney-based composer. It has been a fantastic experience, and although I improvised quite a bit, the results have been extremely rich and valuable.
Now I'm confronted to writing the report for that case study. That is not an easy task. The best place to start is probably with Robert Yin's books -- Case Study Research - Design and Methods and Applications of Case Study Research.
I think the most difficult part of the report is to build the case for you case study: justify that it was the right way to go and that you've set up the proper environment to collect meaningful data. Analysing and summarising your findings is the fun part, and I can't wait to get to that point :)