Welcome bmwlover! I am pretty new to the sport myself and really am loving it. I'm about 10 years older than you and am wondering why I waited so long to get started. The guys and gals here on this forum can/will be a really big help, so keep checking it out. As for this
(misjudging distance is huge, you have to be right!)
it is absolutely true. If you find you have trouble with this, I would suggest a pendulum sight until you get it down pat. And just my 2 cents on the pendulum, they are great for hunting but are not an excuse for slackness. Do the drills, learn to estimate yardage, and practice practice practice! Oh, don't forget to have fun and share it with a friend! Good Luck