It is not considered a difficult trade because it involves craftsmanship that can be done on any home or office windows either using traditional methods, with the help of modern equipments. It is very important to know that this kind of work is still governed by specific safety rules, so you have to abide by these restrictions while glazing your windows. The most common types of window are Low-e coatings for blocked heat transfer and highly reflective coatings for reducing solar gain. If you’re new in the business of window making, there are certain skills needed before you start working on them which includes installation techniques, cutting methods, joining techniques, etc--these are tasks that requires skillful hands on practice. Once mastered it is not a difficult task.