There's a big technical/ mental component to it also. I see a lot of guys doing PC in the gym because they want to get yolked traps but end up more or less reverse curling the weight. This cohort can sometimes be lumped together with those that don't squat too much.
If you don't learn a systematic approach to OL then I find that more often then not you have a mental block of getting under the bar (think splitting feet way wide instead of front squatting) because it happens quickly, requires tons of coordination and they may be unsure of their ability to fully front squat a weight. Luckily, this is typically an easy(er) problem to fix. First, get comfortable squatting, overhead, front, back you name it.
Do it frequently (like as much as 3x a week) and do it heavy so that there's no doubt you'll be able to stand up with it. Then get flexible, hips, hams, calves. After that I'll usually take someone back through the second pull of the clean and teach them to properly rack the bar when in the front squat position. And after a few weeks/months of correction they're smashing previous lift records with more range of motion.
This outline is for a full clean for just a power clean one thing to be weary of is in the first motion off the floor you get your hips as high as they'll go then try to RDL (retarded dead lift?) the weight up to the rack position.
All of this is of course highly variable depending on what you are trying to get out of it. If you're trying to compete then get better at full cleans. But if you're just trying to get more explosive you can stick with just PC, I guess.