Brettski, I hope you have a good set of magnets for your boots! Those metal roofs might get a bit slippery with the water/snow.
I think you might convince Moe or Curly to get up on a wet metal roof, but even I have a few more marbles than that. Right, Theo? - I have found that the painted metal roofs are completely free of any manufacturing oils. Heck, they better be....they're finish coat is paint. Anyway, the key is a good pair of rubbery tennies and a damp towel at the base of the ladder to wipe the dust off the shoe bottoms.