It's not difficult.
Today there are several denominations claiming to be offshoots of the Old Catholic church. What kind of seminaries do these people go to? What kind of education and training do they have? It's usually the Old Catholic church and it's assorted denominations or offshoots, claiming Apostolic Succession, which seems to be doing most of the ordaining of women and gays and other misfits. Maybe some of their priests have excellent credentials, and please forgive me for stating it this way, but it seems to me many of them are rejects from the Roman Catholic Church.
Heartland Old Catholic Church I know two of the priests on this site. One was a counsellor at a neighborhood community center when I was a teenager. As a kid he wanted to be a priest, instead he tried his vocation as a Franciscan brother. That didn't work out, so he came home, got married, and was eventually ordained a permanent deacon for the archdiocese... Now he's divorced and ministers as an Old Catholic monsignor. Not too stable.