Wow so sorry you had such a bad reaction with the Rebif. Copaxone is every single day, but that makes it easy to remember
You can use the autoinjector or do it manually, it's entirely up to you. The autoinjector is really nice, and if you have any questions Shared Solutions is great. Our first one malfunctioned and we just called them up and they sent a new one free of charge. In the meantime though, we had to inject manually and it turns out he prefers that method, says it doesn't hurt as much.
Just rotate the inject sites every day, theres eight of them. You might get a lump and stinging sensation as the med goes in, but it doesn't last long. He's been on it for six years now. There has been a few occassions where he has gotten chest pain and shortness of breath right after injection but that was gone in like 15 minutes. No major problems or side effects though. I hope it goes as well for you! Good luck and let us know how it goes for you.