Start trimming the top and bottom from the front of the fly. Then trim the sides and then rotate the fly while rounding it more and more - still from the front. If your vise doesn't rotate, hold the fly in the hand while doing this.
… I have a small favor to ask.
Support the Global FlyFisher through several different channels, including PayPal.
The Global FlyFisher has been online since the mid-90's and has been free to access for everybody since day one – and will stay free for as long as I run it.
But that doesn't mean that it's free to run.
It costs money to drive a large site like this.
See more details about what you can do to help in this blog post.