One of the most important aspects of working on any BB is identifying your threading. Italian and old (approximately pre-1980, although this varies by manufacturer) French bikes have RH threads on both sides, whereas British-standard (American, Japanese, Taiwanese) and Swiss-standard (Austrian, German, and post-1979 French) bikes have superior self-tightening LH threads on the drive side. Most repair manuals advise against removing the fixed cup, except to replace it, and I recommend using LocTite on French and Italian fixed cup threads.