Personally, the biggest obstacle I ever had is failing to set my targets high enough.
These concepts of goal setting and action taking are not taught in schools, courses, or conferences. Living your life at 10X levels is the only method I have found that determines the correct estimation of effort.
Living a 10X life is simple— put forth 10 times the amount of activity you need to accomplish a goal. In sales, I did 10X more presentations, made 10X more phone calls, and met 10X more clients.