You asked

Is the leica summicron m 35mm f 2 asph hard to focus manually?

The Summicron-M 35mm f/2 ASPH is manual focus only, with no autofocus. I don't cover how it feels to focus in practice, so I can't say whether it's hard for you. Manual focus is the norm on Leica M cameras, and plenty of people use these lenses every day.

If you want to try manual focus on a cheaper lens first, the Lenses guide explains how old manual-focus lenses adapt easily to mirrorless cameras. You can see every compatible camera on the Leica Summicron-M 35mm f/2 ASPH page.

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