Don’t call it a “problem” because that’s fraught with negative meaning, as in “What’s your problem!” Call it instead an issue, challenge, etc. (For purposes of this document, we’ll just say “problem” as shorthand.)
Create a quiz: “Five signs that you may have Osgood-Schlatter Syndrome.”
Detach the person from the problem. In other words, explain how “You are not a procrastinator, but instead you sometimes procrastinate.” That lessens the perceived effort, because it’s fixing one thing about the person and not sounding like the whole person needs an overhaul.
The mere fact of showing how there may be a legitimate solution to this problem could get people to admit what they’ve thought for a long time, and finally take action.