The above is all good. Fly fishing is addictive - I started this year and love it. If you can I'd recommend giving it a try.
Some things that will help - always approach from downstream. The presentation of the fly or lure in the water is crucial, it has to look as natural as possible. These are not big aggressive bass that hit anything near them, they spook super easy and are very picky eaters.
Half the marvel in these mountain trout is just how gorgeous they are. It's not like landing a big 6lb bass where all the fun is in the hit and the fight. The fun in trout fishing is finding the fish, coercing them to take a fly, a usually small fight unless you find a real cow, and really just admiring it all.
Thats for me at least - hauling in big ugly bass never really appealed to me and I wasnt much in to fishing until I discovered how truly special the trout fly fishing experience can be.