G'day and welcome to TBN from Downunder.
What a great question to ask! Heck, I needed the blokes in 'the shop' to show me how to load the bloody thing... this question must have been lurking in the back of my mind ever since. Ta! :thumbsup:
You'd be surprised how many people don't know how to use a grease gun or even how it works. But, there's nothing shameful, or, as the OP said, "dumb" about that. That's why it's called learning.
On another note: Your avatar reminds me of my ex-wife... nag, nag, nag, nag, nag. Lol!