If you soak the hide and hydrate it, you can pull it and it will be easy to see the direction of the grain. When I have to set a thin hide like a cat or turkey or mink I stretch the hide and glue up to the seam and actually pull a little slack at the seam. Lets say your handle leather is cut dry where it leaves an 1/16" gap, soak it and pull it where there is no tension on the seam this is where I like a little slack. After it drys the slack area will shrink more than the glued area tightening the seam. With a thin hide it is important to glue, other wise the shrinkage will be uncontrolled. First time I mounted a goose I was told I didnt have to glue, looked good for a month and then it began to look like it was ready to spill its guts all of a sudden.