@sashag A voice coach will help you set goals and focus on the work to achieve them. It's also very possible to pick and choose the practice on your own. Like you, I have a singing range that spans Nick Cave to Kylie Minogue, so I have mostly learned some basics on adjusting my pitch and weight. But there's more...intonation, cadence, etc. I'll likely eventually get a voice consultant to help evaluate and direct my self study.