Why won't a replacement door handle click into place?

What the numbers show

Counted from the threads quoted below. How we count

• This comes up 26.4× more often in r/HomeImprovement than across the site as a whole.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   Searching for online tutorial videos or manufacturer guides
2. 2
   Replacing the entire door lock actuator
3. 3
   Bashing the part into place or attempting a forceful installation
4. 4
   Hiring a friend or family member for a discount labor rate
5. 5
   Hiring a professional contractor or door specialist
6. 6
   Attempting DIY installation despite lacking tools or experience

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.