You do not want the drug meant to subcutaneous to go into the blood steam. This is true for GPL-1s (all peptides for that matter), as well as insulin, and definitely mRNA vaccines.
I've never used Ozempic, but my understanding was it used a device similar to insulin pens--dial you dosage, attach needle, insert needle, press at the base of the pen to inject the selected amount. Also no way to pull back to see if you hit a vein/artery.
Either way super simple and quick. Fairly painless. I had a weird rash one time, but apart from that a total of about 15 injections haven't had any issues on either Ozempic or Trulicity in terms of injections. Others may have difficulties, but it's been super easy IMO.
Peptides don’t have the same negatives as say insulin, but preferable to not have them in your bloodstream nonetheless.
And it's mostly for people who have plenty of stomach fat, so even less chance of hitting something else.
I went down this rabbit hole after being handed a 100 pack of insulin needles and an estradiol vial with zero instruction - seemed irresponsible at first, but it turns out it's pretty hard to mess up.
https://www.cmh.edu/siteassets/media-documents-for-depts-sec...
SubQ has an even lesser risk of hitting a blood vessel.