Idk it was extremely easy for me. With SS already having my prints, picture, trust, buying a stamp with them I didn't even have to show up in person at my ffl for any of it. My can was waiting to be certified for like maybe 10 days, I got a phone call from ffl, I log in to my ss account, hit a join session button, we fill out a small amount of info, user ID and pin, submit. Done.
People getting mad because they had to wait 2 weeks when the estimated completion time is supposed to be like 8 months faster than current approvals. Like relax and be patient it's a new system. You are still going to get your can many months sooner.