Re: Cody, Wyoming
Couple suggestions....I'm guessing you have already found North Fork Anglers and the other shop in town? Go check out the conditions and river report boards posted in those shops - maybe the waters you are trying to fish are in run-off making fishing tough anyway.
Secondly, not sure what waters you are fishing - but the NF Shoshone is a fairly big river. I would suggest finding and hiking to a much smaller, maybe a little more remote stream. Trout will typically be smaller, but also more aggressive. Drifts and fly drag is always important, but smaller remote streams full of aggressive trout are more forgiving and you can have some success while you improve/learn. The smaller water will be less intimidating in terms of picking out good runs, riffles, pocket water etc....typically easier to read the water. Easier to get nymphs to bounce along the bottom.....once you start having success on smaller water, pay close attention to what you have learned re: reading water, likely holding water and then carry it over to bigger waters.
Simply: just go - there is more water within a 2 hour drive of Cody than you can fish all Summer.