It went about as well as I thought it would.  Being the first real form I ever built by myself, I was worried.  I know some things I could have done better in hindsight.  But all in all it went well.  Have a look.

Compare that last photo to the first.  See those diagonal cross braces that are noticeably missing from the first photo?  The form against the garage wall had started to buckle when it was about 3/4 full.  I shouted to grab some boards and wedge them in there, all was well.  Perhaps it was only going to bulge and not burst, but who would want to find that out?

Disclaimer: The work above is what I did. I’m not claiming this is the way you should do it in your home. Almost every situation is different, and should be treated accordingly. If you are not sure of what you are doing, or not comfortable doing it, the best advice I could give you is to STOP! Get advice from a Pro that you trust, or at least knowledgeable friends or family. You can make expensive mistakes, or worse – you could get hurt. Be safe !