Does the 459 series have a barrel accessory program? If so try to get a 26-28" barrel for it. Remove any extras like extended mag, lights etc if it has them to get as close to a neutral balance as possible. Don't be afraid to ask questions or for critique. We can't see your form or how you shoot. Best three things I can tell you is look at the target, keep your head down and follow thru, do this the rest will come around.
The purpose is to have fun, don't make work out of it.
NRA Life Member