Third Person Melee System

I'm trying to make a third person melee system that has smooth transitions between the animations, similar to popular games, i have been trying for months and i've searched multiple sources and none of them are smooth. For example: in all of the scripts i've written, saw or played with if i have 3 animations and the player presses the mouse button 4 times very fast it creates a lot of unwanted results. i am a beginner at unity, and i have been struggling with this for a long time.