Wall curve and shelf mount....madness and method?

Hi folks,
I am installing lights. Best Half wants reading lights mounted on the underside of shelf (well, so does this 1/2) The shelf in question will extend across the front curved wall of the T, just above our head height when sitting.
I need help on figuring out how to mount a cleat on the wall so that it will be level. In other words, how do I compensate for the curve in the wall ?
If I had a table saw, I would cut a close angle and sand to fit. But I don't have a table saw. Advice appreciated....
Hope builds going well for you all!
Jim
I am installing lights. Best Half wants reading lights mounted on the underside of shelf (well, so does this 1/2) The shelf in question will extend across the front curved wall of the T, just above our head height when sitting.
I need help on figuring out how to mount a cleat on the wall so that it will be level. In other words, how do I compensate for the curve in the wall ?
If I had a table saw, I would cut a close angle and sand to fit. But I don't have a table saw. Advice appreciated....
Hope builds going well for you all!
Jim