Here's what seems to actually happen, on repeat, for people who inject on any kind of schedule:
You get your supplies out. You see the needle. Before you've felt anything at all, your brain has already started reacting to the idea of what's about to happen, not the sensation itself.
That kicks off a small wave of hesitation. You manage it however you've learned to manage it - a ritual, a distraction, a pep talk. Then you inject. Then comes the relief that it's over.
And then, next week, or tomorrow, or tonight - you do the entire loop again.
Prepare → see the needle → anticipate → hesitate → psych yourself up → inject → relief → repeat.
On its own, none of those seconds is a big deal. But you're not doing this once. You're doing it 52 times a year. Or 180. Or 365+. And that's where the real cost shows up: not in any one shot, but in how much quiet mental space the idea of the next one takes up in your week.
That's the actual "hard part" almost nobody names out loud: you're not afraid of a needle. You're tired of having to gear yourself up for one, over and over, for as long as this is part of your life.