Quoting Mama BooBoo(::" i'v been really thinking of the implanon ( or now the nexplanon) my prenatel nurse said that's honestly ... [snip!] ... to make me gain a bunch of weight lol. i know any of them can cause weight gain but i'v just heard depo is worse about that!"
It didn't hurt at all to get it put in.
What they do is have you put your arm over your head(laying down)
Give you a shot to numb the area and wait a bit
Then they use a pen looking thing and put the tip in your arm and hit the button to insert the rod.
Pain free for me. I bruised like crazy though because I'm anemic. but the bruise didn't even hurt. There's slight pinching while you heal but not a big deal.
I can post a video I watched on youtube that made me feel better about it if you'd like