D19 is/was a technical type developer, with some mid tone, but a high contrast and good for fine line detail. If you have access to it, consider an experiment with it.
When you say handheld, I trust you mean well braced. If these negatives are being exposed while you are standing, I would recommend the use of a 'string tripod' if a regualr tripod is not allowed.
Place a 1/4x20 eye bolt in the camera tripod socket, and tie a strong piece of string to it. I use sash cord, and knot it every 6 inches so that it wont slip easily under my shoe.
Stand slightly less than fullt erect, step on the string. Slow your breathing, and get it regular. Elbows in, string dangling pulled taught as you straighten out, I find with up to 70mm lens in 35mm, 80mm in MF I am able to get good sharp exposures down to /15 quite regularly.