First you have to know your prey. Where they live, what they eat, where are the escape routes. Scout, scout, scout.
Killing an elk is Washington is no gimmie.. Its a trial and errors sort of thing.
I know on the Eastside as soon as the snow melts I am in the hills. I myself have hunted the same area now for 28 years and I am still finding spots I never knew were there.
Study the elk, then simple decision bow or rifle..