I've just completed my 5th AFF jump this past week and had experience my first hard opening. I was able to jump d-1 and d-2 in the same day. The d-1 jump went great, until I opened up. It was my first time having a hard opening. I snapped forward while my chin and nose was smacked by one of the risers. I received small abrasions but nothing major. My chute was good and my landing went very well. How ever my second jump went the same way but with a painful landing. ANOTHER hard opening and to my surprise a couple broken lines as well. I counted 2 broken lines but later I discovered I think there were actually 4!. The chute was square and stable but not so steerable. I should have just cut away once I saw the broken lines but I was nervous of cutting away. In result I landed in a field next to the airport I was at and my tail bone took most of the trauma. X rays negative nothing broken but very very sore!. I will not hesitate the cut away if I have any broken lines again. I was taught to arch right after you throw your chute out, is that to help prevent injury if you have a hard opening? How can you avoid hard openings? is it possible?