My mother and my Aunt were both told by a man about 25-30 years ago that the only to trim shrubs was with a pair of hand clippers. He gave my Mom a reason that had something to do with sun light girting to branches underneath. She whole heartedly believes that the only way to do it is with hand shears. She has allot of Azeleas and Holly bushes. I know nothing about doing it, but I just can't imagine that it is not a more efficient way of doing this. He has them both convinced that hedge trimmers are terrible on the bushes. Please help!