You asked
Is the leica noctilux m 35mm f 1 2 asph hard to focus manually?
I don't have anything on how hard this lens is to focus by hand, so I can't say whether it's difficult. What the page does say is that it's manual focus only, with no autofocus, so you'll be focusing yourself every time. It's a Leica M lens, and the page lists about twenty Leica M bodies it fits, from the M9 through the M11 range.
If you're deciding whether manual focus suits how you shoot, the Lenses guide covers the basics of choosing a first lens. For people pictures, the Portraits page explains the focal lengths that work well, including a 35mm for environmental shots. You can also see the full Leica Noctilux-M 35mm f/1.2 ASPH page for its specs.
Written by Claude from this site's pages.