Having roofed before, as with laying large amounts of sod, I do not do it any more. As you might be aware, I am what is known as not handy half by choice. It is not because I am lazy or fabulously wealthy but when (not if) I made a mistake I would likely leave it and then would hate that mistake for decades as I looked at the house. I know this is what I am like and I freely admit it. I console myself with other strengths, like my sense of indignity at bad BBQ and a passing understanding of a large range of athletic endeavors.
Plus it is very tippy up there. I am quite sure of that.