How proficient were you before starting Competition shooting?
tldr: "Competent" for PRS-style matches (which is the interest of many if not most people here) means you know how to set your rifle for first-round hits out to 1000-1200 yards and move safely across various props. "Good" is something else altogether.
Sigh. I used to hear it all the time as an NSSA skeet competitor:
"I'm not going to compete until I'm good enough."
Here's what "being good" means. The story is around shotgun competition - but it carries into any shooting discipline.
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I had been shooting skeet "for fun" for about 20 years before I joined NSSA and shot my first competition. Most people I shot with up to that point said I was "good." When NSSA competition came to my club via a few NSSA shooters relocating to the area and generating new interest, I finally attended my first shoot with them down in Pinehurst, NC - a historic club run by Annie Oakley back in the 1920 timeframe.
I shot a 96 (out of 100). "Good" by shoot-for-fun-on-Saturday-afternoon standards.
Out of 50ish shooters, I was down in the middle of the pack. Far from top gun and not really close to any class awards.
But the fire was lit. Ten years later, I was buying powder in 8-pound jugs (one each for 12/20, 28, and .410), primers in 5k sleeves, and shot hundreds of pounds at a time.
I achieved AAA classification in all four guns (12/20/28/.410), meaning an average of .985 / .9825 / .980 / .965 or higher respectively.
And I didn't win a damn thing the whole time I was classed there - because my 98-99 percent averages were competing with people whose averages were in the .999+ percent range. A couple of them went entire seasons with 100% (no misses) in 12 or 20 gauge, where a minimum of 1200 and 1000 SCORED targets respectively had to be shot for awards consideration.
I was "competent" the first time I shot NSSA skeet. By the same standard, I was "competent" when I shot my first PRS-style match. But "Good?" Pfft. I remember pulling targets for a little kid who was running hundreds before his voice changed. He was a natural. He had multiple national titles to his name before he was out of his 20s.
"GOOD" (Proficient?) IS A VERY RELATIVE TERM.
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So, once you have a MOA-accuracy-capable rifle and enough skill to set it for (hopefully) first-round hit at any reasonable range given to you, go compete. As long as you're safe and keep a good attitude when you invariably make newbie mistakes, you'll be fine.