Lurch,
I am not blessed with many power tools so I use the hand tools that I have. It takes me months to turn out a decent horn. A raw horn is quite a big challenge for me. Lots of rasping and more rasping,then filing filing, then scraping,engrailing, then sanding shaping,filing shaping sanding scraping.
Then, if the said horn has a nice white barrel, you might want to do the scrim on it.Yet another pile of hard work (at least for me).Planning, executing,etc...
Just like rifle building, you want to do your research, plan your horns shape and architecture, and then have at it.
My hat is off to the gents on here who can "knock one off" in a few days! Holy Canoly" as Roger would say! Take a look at Tim Crosby's work, or Seesbird's work. These guys are real artisans, something that took a long time for them to get good at.
Lurch,go get another raw horn and try again.Chock this first one up for exactly what it is,a first horn. You will do better. Take your time,man!
ps, if you need a horn fast, buy one off John Shorb. Decent horns, quite reasonable.
I think his link is powderhornsandmore. google it.