Yarmony's pretty straight forward at around 1000cfs. It's the second rapid in that canyon.
As the river turns left, there's a big round rock right-of-center at the very top of the rapid. Go left of it. The funnest wave is just left of that rock, but it can be skirted by going a little farther left. Make sure you hit that wave straight on, tho.
Couple small rocks to dodge in the middle of the rapid, as it's turning back to the right.
Then ride out the wavetrain at the bottom, just left of center, making sure you don't hit the rocks coming off the left shore or the left side cliff at the bottom of the rapid. The water tries to push you onto that left shore a little bit.
The rest of the canyon is easy, read and run.
I'm the head boatman for a rafting company running pumphouse. We do a bathroom break at Radium everyday around 1130am.
If you're nervous about it, you're welcome to follow us down, if the timing works for you.
Just look for a fat guy with a big red beard on red Achilles rafts, usually at the upper launch site.
Good luck, and have fun!!!!
All I need are some tasty waves, a cool buzz, and I'm fine. - Spicoli