This is sort of my standard advice when this stream, or several similar Poconos remote high gradient streams, come up...
Plan carefully and take a good study of the topo maps and have a good plan before you fish it. It's not as simple as fish upstream til you decide you're done and walk back on a nice trail to where you parked. Other than at the very bottom, or the very top, the only way you can navigate a stream like that is in the stream channel itself. Coupled with the gradient, this amounts to something closer to climbing in many spots than walking, and the gradient can turn relatively modest flows into more water than you can safely deal with. There's a particularly hairy spot on Jeans that involves a sideways traverse across a narrow rock ledge along a waterfall 20 feet above the streambed.
Short version...Be careful, tell someone where you're going, and when to expect you back. Better yet, fish it with a buddy. Jeans is probably #1 on the roughest small stream in PA I've ever fished. Once you get into the middle section, you're kind of committed to either climbing up to the top, or back down to the mouth. Getting out sideways isn't an option. Not trying to discourage you from fishing it, but just giving you the info I'd want if I was going there for the first time. (I fished it for the first time with someone who had been there numerous times and told me what to expect. It was way rougher than what I would have thought on my own going in.)
Figure on taking a shorter rod if you have one, with a relatively short leader. It's relatively open in the higher gradient spots, but it has a lot of rhodo along it, which becomes an issue in the few spots where it levels out. As far as flies...It's July and they're Brookies... Anything that floats well and is easy for you to see.