Well, you want a laundry list of stuff, here it comes 🤣......
* I may go a little extreme but my leaders range from 15' - 20' (butt to fly). Can you catch fish on a 10' leader? Yes, but you better be deadly accurate with the cast.
* Are you able to carry multiple rods on the yak? It would be very helpful to do so. I typically have a rod rigged with LONG leader / lighter tippet, a second dry rigged with a little shorter leader / heavier tippet as well as a nymph/wet rod rigged. Light tippet might be 5x with a rusty spinner, heavier might be 3x or 4x to a drake/ISO/stone dry. Nymph rig has 2-3 flies. Size will be based on what is hatching. I use little to no weight (beadhead instead of shots) and move them frequently. Without weights, you'll pass over fish in the heavier water but you get to the ones in slow or REALLY shallow water.
* Flies: CDC, emergers and other flush riding patterns rule the day up there. Rarely do I have anything with much hackle on it. The fly doesn't have to match perfect for size and color. Just needs to be close with correct profile. Dries....rusty spinner in #12-20, tan caddis #14-18, black caddis #12-16, cornuta olives #14, drakes (green, brown and yellow) #10, golden Stone #8, olives #18-22, sulphurs and Cahills #14-16. Nymph..... Caddis pupa in tan and bright green #14-16, BHPT #12-18, bright gold stone, olive or natural birdsnest #12-16.
* Do not EVER launch unless you know where you are going and have appropriate gear (extra jacket/rain gear/dry bag). You WILL need a net with large hoop and likely a longer handle. Head lamp is a must because you might be fishing until 30 minutes past dark and still have 2 miles to go.
* Assume it doesn't hold fish and you might miss the fish of a lifetime. Those rainbows will hold in 8" of water and in almost stagnant pools. Browns seem to prefer the deeper water, cover and slightly less current. Can you catch 4 chubs in a row and then have your reel dumped into the backing on the next cast? Absolutely. You never know. Once you hook up, clear the line and keep your fingers away from the spool because it might be spinning like a top and you'll break the fish off or have a bloody knuckle.
* You should spend more time looking than casting. Some rises are almost undetectable in the chop and light conditions. Be prepared to spend 2 hours on a fish, change flies 6 times and then leave rejected. Be able to hit your target at 50' with slack leader and then feed line out quickly. Casting down and across is a must. Casting up and over the fish is a very low percentage play. If you have the the desire to pull over and chase some on foot, do it! Just be careful as there are DEEP pools but plenty of spots to fish on foot.