HI,
I almost sprayed milk all over the computer when I read your post. I have done the exact same thing. I took on a little scooter job and being the noob that I am, I had a hard time painting the various angles of the frame and fender surfaces. After I took a lot of time to make the front fender all perfect like I scuffed up the clear coat for another round of clear. I turned around and accidentally bumped it off of its stand and it was all kinds of screwed up. I basically had to start from scratch. I too let out a stream of colorful vernacular too
For buffing there are two techniques that I have found to be somewhat fool proof:
1. Have my coffee drinking, want's to get outta the house and do something cool neighbor come over and hold it for you. (or find your own)
2. Mount it on the bike. I have seen my local super amazing mentor painter-guy proshop dude do this. The only problem being that there will be places that you cannot reach.
Here is also an older thread about stands for painting helmets that has some good info:
Helmet stand
I use these 2X4 stands for everything because I can drill into them and change them up for any kind of race skin or road bike frame or whatever. I also use small metal rods and dowels to fit in the threaded areas that aren't going to be painted so that they are held down really well. The pic of the black and white racing skins shows how the skins are conveniently draped over the stands.
Another option would be
These a little rich for my cheapness but they look like a killer product.
There are a couple pro shop guys that are members that prolly have some killer tips too.
Good luck and sorry to hear about the HD fender!