I've just begun my first project as well. I've been working on my drivers side front fender during adult nights at the local Vo-tech high school. So far I have constructed three patches. I'll post pictures soon. I have used a combination of air tools at the school and my own electric tools. I have found both to be useful in different situations. To cut/grind in really tight places I've even used my Dremel It has been especially useful in cutting welds that held old patches in place, esp brazing welds. To make long sustained straight cuts I've used the air tools. I personally had difficulty cutting around a curve, or grinding in tight places. I have noticed that my newest purchase a 4" Makita angle grinder (consumer grade) gets "hot" if I run it too long. My guess is that it will eventually burnout. Bottom line I use a combination, my personal thought is that if you get the right air tools they will last a lifetime where as I expect that I will burn out my electric tools and they will need replacement
