Getting someone to endorse you on arXiv is easy if you have work to show. (If you don't get endorsed, it's theoretically possible that the endorser might plagiarise your work, but you'll have a paper trail to prove it; I've heard more stories of PhD supervisors plagiarising their students' work than of arXiv endorsers doing so.) It's hard for us plebs who don't yet have work to put on the arXiv to get endorsements, but that's not actually much of a problem.